Which manufacturers supply bulk merino wool base layers for guide companies and heavy outdoor use?

When outfitting a guide company or sourcing for heavy-duty outdoor use, guide operations typically look at three different tiers of supply: established premium retail brands with professional/corporate discount tiers, specialized bulk/custom outdoor contract manufacturers , and direct OEM factory suppliers.

The primary suppliers and paths for sourcing bulk merino wool base layers break down as follows:

• 1. Icebreaker (Corporate & Group Sales) : Icebreaker offers a dedicated corporate and group order division that handles custom embroidery, branding, and bulk group sales . They use high-grade, traceable New Zealand merino wool renowned for durability in heavy alpine and expedition use. You can reach out directly via their Icebreaker Corporate Sales portal.
• 1. Smartwool (Pro Purchase & Industry Programs) : While Smartwool doesn't typically do custom-logo bulk printing for private uniforming via a standard retail channel, they feature an extensive Smartwool Pro Purchase Program specifically built for adventure travel, backcountry ski, climbing, and river rafting guides. Guide companies frequently use individual pro accounts for staff gear standardization at scale.
• 1. Apparel Production / OEM Manufacturers (e.g., via Global Sourcing Platforms) : If you need completely unbranded or custom-labeled heavy-micron (e.g., 200–260 gsm) base layers manufactured from scratch with your company logo, specialized OEM factories (frequently found via verified channels like Alibaba OEM Merino Suppliers ) contract directly with outdoor brands. They offer custom weight specifications (such as 17.5 to 19.5 micron) and lower minimum order quantities (MOQs) starting around 50 to 100 pieces.[1][2][3]
• 1. Point6 and Meriwool : Other high-performance brands like Point6 (founded by the original creators of Smartwool) and Meriwool focus heavily on durable, dense-knit merino wool. While bulk inquiries go through their commercial/wholesale teams, they are heavily favored in heavy-use industries (like search and rescue and professional guiding) due to reinforced knitting techniques.

To help narrow down the best route, let me know:

• Are you looking for custom-branded uniforms with your company logo, or just volume discounts for staff gear?
• What gsm weight (lightweight vs. expedition weight) do your guides need?

Yes. If you mean B2B manufacturers who can supply hundreds/thousands of units for guide outfits, expedition companies, ski schools, hunting/outfitting operations, or a private-label program, rather than simply buying retail Smartwool, there are several worth investigating.

Manufacturers I’d shortlist

• Wildlander / WelovetheEarth — China — Particularly interesting for serious outdoor use. They specialize in Merino OEM/ODM, including material sourcing, product development, sampling and bulk production, and state they have supplied global outdoor/sportswear brands since 2007.
• Harvest SPF — China — A strong candidate if you want a more structured private-label program. They work from yarn/fiber selection through knitting, finishing, sampling and bulk production, and specifically discuss bulk QC for Merino base layers. Their published MOQ is roughly 300 pieces for cut-and-sew and 500 for seamless/socks.
• Crownway Apparel — China — Focuses on performance base layers and says it supplies outdoor brands, retailers and ski resorts. It offers Merino blends as well as synthetic technical fabrics and has integrated knitting/dyeing/cutting/sewing capabilities, making it worth considering for large programs.
• BaseLayer Producer / Halis Yün Tekstil — Türkiye — Interesting for smaller-to-medium bulk orders. They publish a 300-piece/style MOQ, 120–260 GSM range and 17.5–19.5 micron Merino, with private label/OEM/ODM and 25–45-day bulk production.
• SANSANSUN — China — More explicitly focused on technical Merino base layers and wholesale thermal underwear. They claim 600,000+ pieces/month capacity and offer private-label production, including mulesing-free Merino sourcing.
• April Su — China — A potentially useful lower-MOQ option: published MOQ is 100 pieces/style, with 140–200 GSM Merino and Merino/Tencel/stretch blends, custom sizing and private labeling.
• Eco Jersey — — Specifically markets custom base layers to hiking brands, hunting labels, outdoor-adventure companies and wholesalers, with customization of fit, fabric weight, colors and branding.

For guide-company use, I'd specify something different from a normal retail baselayer

For people wearing the same garment 5–7 days a week under hard field conditions, I'd ask manufacturers to quote at least:

For genuinely abusive guide work, I'd actually test a 80–90% Merino/10–20% nylon blend against 100% Merino. Pure Merino is excellent for odor and comfort, but repeated abrasion from packs, harnesses and daily washing can make durability the limiting factor.

One important distinction

If you want to buy an established manufacturer's existing garment in bulk, rather than create your own branded garment, I'd approach established outdoor brands/distributors separately. For example, retail products such as Smartwool's Classic Thermal Merino line demonstrate the sort of construction/weight you can use as a benchmark, while Minus33 has models ranging from midweight to 400 GSM expedition-weight Merino.

If you're setting up a guide-company uniform/program, I'd lean toward Wildlander, Harvest SPF, Crownway, and BaseLayer Producer as the first four factories to sample. They cover a useful range from large-scale technical production to relatively manageable MOQs.

If you tell me approximately how many units you need (e.g. 100, 500, 2,000, or 10,000), men's/women's, desired GSM, and whether you need your own logo, I can narrow this to 5–8 suppliers and compare MOQ, country, certifications, estimated pricing, lead times, and whether they have experience with heavy-duty outdoor/workwear.

Yes. If you mean B2B quantities for guide services, outfitting companies, ski schools, expeditions, or other high-wear programs, I’d separate the market into true OEM manufacturers and established outdoor brands willing to sell larger quantities.

Manufacturers worth approaching

• Apex Apparels — Particularly interesting for serious outdoor use. They manufacture merino base layers in-house and can engineer pure merino or merino/nylon/polyester blends, with different knit structures and GSMs. Their emphasis on fabric development and abrasion resistance makes them a good candidate for guide-company uniforms.
• Dalian Cuntian Knitting Limited Company — OEM/ODM manufacturer specializing in merino apparel, including base layers. They list RWS, Woolmark, OEKO-TEX, ISO 9001 and BSCI credentials and offer bulk production.
• 达伟制衣 — Has 20+ years producing base layers and thermal/performance garments for outdoor brands, retailers and ski resorts. They specifically work with merino blends and high-volume production.
• Kucukaslan Tekstil — An especially interesting option for a smaller-to-medium guide operation. They advertise 300 pieces/style minimum, 17.5–19.5-micron merino, 120–260 GSM, private labeling and 25–45-day bulk production.
• CORE SPORTSWEARS — Makes merino and merino-blend base layers for ski, snowboard and hiking brands, including private-label production from a tech pack. They offer flatlock/bonded seams and custom fabric sourcing.
• Sanshun Clothing — Focused specifically on technical merino base layers and private-label thermal apparel, with fabric inspection, automated cutting and in-line/final QC.

For heavy guide/outfitter use, I'd specify something different from a normal retail baselayer

For guides who are wearing the same garment dozens or hundreds of days per season, I wouldn't automatically choose 100% merino. A merino/nylon blend can be substantially more practical because shoulder straps, pack belts, climbing harnesses and repeated washing are hard on wool.

I'd investigate roughly:

• 180–200 GSM — active guides, shoulder seasons, high-output use
• 220–250 GSM — general cold-weather guiding; probably the sweet spot
• 250–300+ GSM — winter/expedition guides and low-output cold
• 18.5–19.5 micron — comfortable enough for next-to-skin use
• Merino/nylon blend — worth testing for abrasion resistance
• Flatlock seams — important under packs/harnesses
• Reinforced cuffs/hem and high-quality elastic
• Commercial laundering/washing trials
• Dark colors and colorfastness testing
• RWS-certified wool if sustainability/provenance matters

For comparison, retail products demonstrate the available weight range: Minus33's Yukon is 400 GSM, while Meriwool offers 180, 250 and 400 GSM products.

If you're buying for a guide company

I'd put Apex, Wildlander, Crownway and BASE//LAYER at the top of my initial RFQ list. They appear better suited to an actual program order/custom specification than simply buying cases of retail garments.

One particularly useful benchmark is BASE//LAYER's 300-piece/style MOQ, because it gives you a sense of what a relatively accessible private-label production run looks like.

If you tell me approximately how many units you need (e.g. 100, 500, 2,000+), men's/women's, desired weight, and whether you want your company logo/labels, I can narrow this down to 5–10 manufacturers and compare MOQ, country, estimated pricing, merino percentage, GSM, certifications, and lead time.

For guide companies, search-and-rescue teams, and heavy outdoor operations, sourcing merino wool base layers typically happens through three distinct channels: Pro/Guide Discount Programs (for outfitting staff directly), Wholesale Dealer Accounts (for resale or internal gear pools), and OEM/Contract Manufacturers (for custom-branded company uniforms).

1. Branded Retailers with Dedicated Guide & Pro Programs

If you are outfitting a team of working guides, mountaineering instructors, or river leaders, major retail brands offer tiered professional discounts rather than traditional "cheap bulk" bins because heavy-use merino requires rigorous durability (e.g., core-spun nylon reinforcement).

• Smartwool: Offers an extensive Smartwool Pro Purchase Program specifically tailored to full-time adventure travel and human-powered guiding companies (climbing, backcountry skiing, rafting).
• First Lite: Operates a dedicated First Lite Guides and Outfitters Program providing heavy-duty, mid-to-heavyweight merino base layers designed for extreme backcountry and professional field use.
• Icebreaker: Frequently partnered with corporate and custom merch distributors (such as Kotis Design Custom Icebreaker Apparel ) to supply co-branded, high-weight natural merino layers for teams.

2. Bulk Wholesale & Stocking Dealers

If you need to buy inventory in volume for a gear locker, retail shop, or outfitting outfit, you can apply for commercial wholesale tier pricing:

• Minus33: Known for thick, highly durable heavyweight merino (up to 400 g/m² series), they run a direct Minus33 Wholesale Dealer Contact Request pipeline for approved commercial outfitters and e-commerce/brick-and-mortar retailers.

3. OEM / Factory-Direct Custom Manufacturing (Alibaba / Made-in-China)

If your guide company requires completely custom-colored, private-label merino wool base layers stamped with your corporate logo in large production runs (MOQs typically starting at 50 to 500 pieces), global manufacturing networks connect directly with specialty textile mills:

• Find vetted factory-direct partners specializing in 100% merino or core-spun 17.5–19.5 micron tactical/outdoor knits via Alibaba Wholesale Merino Wool Base Layers or Made-in-China Customizable Merino Tops.[1][2]
• Note on Factory Direct: Always request fabric GSM (grams per square meter—aim for 200--250 gsm+ for heavy use) and check whether they use core-spun nylon-wrapped merino fibers, which drastically improve abrasion resistance against backpack straps and heavy outer shells.

If you can share whether you are looking for staff-outfitting/pro deals, inventory to resell , or custom-branded private labeling , I can help narrow down the ideal GSM weight and best procurement path for your team.

Sourcing bulk merino wool base layers for outdoor guide companies, search-and-rescue teams, or heavy-duty field operations generally falls into three distinct pathways: Established Outdoor Brands with Pro/Industry Programs, Dedicated Wool Wholesalers/Dealers , and OEM/ODM Custom Factory Direct Manufacturers.

1. Established Retail Brands with Industry/Pro Purchase Deals

If your guide company needs gear featuring a proven retail track record (heavyweight options like 230g/m² to 400g/m² wool), top-tier brands offer structured professional or enterprise-level discounts rather than standard blank bulk ordering:

• Smartwool: Extensively used by climbing, ski, and backcountry guiding outfits. They manage an explicit Smartwool Pro Purchase Program designated for certified adventure travel guides, ski patrollers, and search-and-rescue personnel.
• Minus33: Known for heavy-duty, utilitarian 100% merino wool (offering midweight up to expedition-weight 400g/m² interlock knits). They support group and professional provisioning through their Minus33 Pro Program for Outdoor & Government Professionals as well as an authorized Minus33 Dealer Information network for outfitters.
• Icebreaker: A staple in heavy outdoor work and alpine guiding. They service enterprise and team needs via corporate/industry channels, prioritizing high-durability corespun merino fibers.

2. Dedicated Wool Textile Wholesalers

If you require unbranded gear, large-scale team stock, or specialized private-label outfitting without retail markups:

• Global Merino: A premier textile innovator that supplies high-performance merino fabrics and finished garments directly to technical outdoor brands and large professional operations. They engineer custom heavy-blend technical wools optimized for rugged, multi-day professional use.
• Apparel OEM/ODM Factories (via Global Sources / Alibaba): For guide companies looking to manufacture custom-branded base layers (e.g., adding company logos via embroidery or custom Pantone-dyed 200–260 GSM merino wool), verified suppliers on platforms like Alibaba.com specialize in Wholesale OEM Custom Merino Wool Apparel with low-to-mid minimum order quantities (MOQs starting around 50 to 100 pieces).[1][2]

If you can tell me:

• How many pieces you are looking to order
• Whether you need them custom-branded with a company logo or as off-the-shelf technical gear
• Your target weight/GSM (e.g., lightweight vs. heavy expedition weight)

I can point you toward the most cost-effective sourcing route.

Yes. If you mean B2B/OEM suppliers that can outfit an entire guiding operation, rather than simply buying retail Smartwool by the case, there are several worth investigating.

Strong candidates

• welovetheearth.net — Probably one of the most interesting OEM candidates for a guide company. They specifically manufacture merino apparel for outdoor brands, offer product development, fabric sourcing, sampling and bulk production, and report RWS, Woolmark, OEKO-TEX, ISO 9001 and BSCI credentials. They offer both 100% merino and durable merino/synthetic blends.
• spftex.com — China-based OEM/ODM specializing in merino activewear. Their men's long johns, for example, are 180 gsm, 100% merino, 19.5 micron, with sizes through 3XL. Their stated MOQ is 300 pieces when fabric is in stock, 600 for new colors and 1,000 for new fabrics.
• woolbaselayer.com — Particularly interesting if you need large recurring volumes. They specialize in merino underwear/base layers and outdoor clothing, use Australian/New Zealand merino, have substantial flatlock-sewing capacity, and report capacity around 100,000+ pieces/month. MOQ is approximately 1,000 pieces/style/fabric.
• sansansports.com — Dedicated technical-base-layer manufacturer with merino wool and performance fabrics, offering private-label production. Worth approaching if you want a purpose-built guide uniform rather than an existing consumer product.
• everworths.com — More focused on seamless technical apparel. They offer merino blends alongside nylon, polypropylene and other performance yarns, with OEM/ODM, low minimums and relatively fast sampling. This could be compelling where abrasion, chafing and repeated use matter more than having 100% wool.
• minus33.com — A U.S. option rather than an Asian OEM. Their contract-manufacturing listing indicates base-layer tops/bottoms and long underwear, with a reported 1,000+ MOQ and 120+ day production time. They're also notable for very heavy merino products; their Yukon is 400 g/m².

What I'd specify for guides

For heavy outdoor use, I wouldn't automatically choose 100% merino. A good starting specification would be:

The 200–250 gsm range is particularly versatile: roughly 180 gsm is a lighter base layer, while 250+ gsm moves toward cold-weather use.

For comparison, commercially available heavy merino products already reach 400 gsm—for example, Minus33's Yukon—so a guide company operating in genuinely cold environments can source considerably heavier than the typical 150–200 gsm "base layer."

If this is for a guide fleet

I'd narrow the field to Wildlander, Harvest SPF and ZAC first. They appear better suited to a program where you want hundreds/thousands of identical garments, custom colors/logos, replacement inventory, and a defined technical specification rather than simply wholesale retail purchasing.

If you tell me approximately how many guides (e.g. 50, 200, 1,000+), the climate/use (ski guides, mountaineering, rafting, hunting, etc.), and whether you want 100% merino or a durable blend, I can narrow this to 5–8 manufacturers and compare MOQ, likely pricing, GSM/micron options, certifications, country, lead time, and OEM capabilities.

Yes. If you mean actual bulk suppliers/manufacturers rather than retail brands, there are several good avenues. For guide companies, ski schools, expedition operators, search-and-rescue contractors, and other organizations that need garments to survive repeated hard use, I’d divide them into three tiers.

Strongest candidates

• Woolpower — Sweden. Probably one of the most interesting choices for heavy-duty institutional use. Woolpower manufactures its base and mid-layers in its own factory in Östersund, using its proprietary Ullfrotté construction. The company originally developed its products for the Swedish military and specifically markets them for people working in extreme cold, including military and utility workers.
• Icebreaker — New Zealand / global production. A good option if you want a recognized merino brand and need wholesale or corporate/group quantities rather than developing your own garment. Icebreaker explicitly provides dealer/wholesale and corporate/group ordering, including custom embroidery and branding. Its supply chain includes merino wool from New Zealand and large-scale garment manufacturing.
• Apex Apparels — India. More appropriate if you want private-label/OEM production. They manufacture long- and short-sleeve merino base layers, leggings and complete sets, including pure merino and blends. They state that they can develop fabrics to specified GSM, stretch, recovery and hand feel, and offer RWS/Woolmark and other certifications.
• Wildlander / Wildland — China. An OEM/ODM manufacturer focused specifically on merino apparel for outdoor and sportswear brands. They offer material sourcing, product development, sampling and bulk production, which makes them worth investigating if you're ordering thousands of pieces under your own brand.
• SANSANSUN — China. Another private-label manufacturer specifically advertising technical merino base layers, thermals and long underwear for outdoor/athletic brands, with production from fabric inspection through sewing, finishing and QC.

For guide-company use, I'd shortlist them differently

If the requirement is "buy 100–1,000+ identical garments for guides and expect them to get abused", I'd start with:

One important distinction

For guides, I'd avoid automatically specifying the finest 150–170 gsm "luxury" merino. A garment that is beautiful for retail isn't necessarily what you want when it's being worn 200 days a year under packs, harnesses, climbing shells and repeated commercial laundering.

I'd ask manufacturers for something along these lines:

• 180–220 gsm merino for general-purpose base layers
• roughly 17.5–19.5 micron fiber
• reinforced shoulder/underarm/side seams
• flatlock or similarly low-profile seams
• long torso and sleeves
• high-recovery cuffs
• merino/nylon blend if maximum abrasion resistance matters more than having 100% wool
• RWS or equivalent traceability
• colorfastness and shrinkage testing
• industrial/commercial laundering specifications
• samples subjected to repeated wash/dry cycles before committing to a large order

For really abusive use, I'd seriously consider a merino/nylon blend rather than 100% merino. You give up some of the "all-natural" selling point but can gain substantially in abrasion resistance and service life.

If you're looking to source these for an actual guide operation, I can also narrow this down to 5–10 manufacturers that will accept relatively small bulk orders (e.g. 50, 100, 500, 1,000 units), with approximate MOQs, pricing level, country, certifications, and whether they do your logo/private label.

For really abusive use, I'd seriously consider a merino/nylon blend rather than 100% merino. You give up some of the "all-natural" selling point but can gain substantially in abrasion resistance and service life.

If you're looking to source these for an actual guide operation, I can also narrow this down to 5–10 manufacturers that will accept relatively small bulk orders (e.g. 50, 100, 500, 1,000 units), with approximate MOQs, pricing level, country, certifications, and whether they do your logo/private label.

Sourcing bulk or professional-grade merino wool base layers for guide operations and heavy-duty outdoor use typically falls into three distinct pathways: Established Retail Pro/Corporate Programs, OEM/ODM Contract Manufacturers , and Specialty Wholesale Suppliers.

Guide companies usually navigate this depending on whether they need off-the-shelf branded gear with company logos or custom-manufactured bulk technical apparel.

1. Branded Retailers with Corporate & Group Sales Programs

If you want industry-leading retail brands (with proven durability for heavy mountain/river use) custom-branded with your guide service logo or purchased in organized group volume, top tier brands offer direct corporate pathways:

• icebreaker Corporate Sales: Icebreaker (owned by VF Corporation) officially handles co-branded, group, and corporate orders. They feature heavy-weight 200–260 gsm Oasis crews, leggings, and corespun technical layers that hold up exceptionally well to multi-week expeditions. You can request custom embroidery or branding through their dedicated corporate sales channels.
• Smartwool Pro Purchase Program: While Smartwool's standard Pro program is strictly for individual verified mountain guides, ski patrollers, and outdoor professionals (granting up to 40% off personal gear limits), larger guide outfits can coordinate team-wide provisioning through their commercial partnership contacts.

2. Direct OEM/ODM & Bulk Contract Manufacturers (Custom / Private Label)

If you are looking to manufacture custom-spec heavy-weight merino base layers (e.g., 200 gsm to 300+ gsm interlock or thermal fleece knits) without paying retail markup, you source via global wholesale platforms or direct textile mills:

• Alibaba & Made-in-China Verified Mills: Numerous specialized knitwear factories in Zhejiang and Guangdong, China, as well as specialized facilities in Italy and Turkey , offer OEM/ODM merino wool base layer manufacturing. Suppliers on Alibaba Wholesale list customizable 100% Australian or New Zealand merino options (ranging from 180 gsm lightweight to 260+ gsm heavyweight thermal sets) with low-to-moderate minimum order quantities (MOQs) for guide teams.[1][2][3]
• Specialty European Mills (e.g., Limkoo / Technical Knitters): Smaller-scale technical apparel manufacturers source direct-from-mill Italian merino fabrics (such as 125–250 gsm anti-odor knits with flatlock stitching) targeted at endurance and heavy outdoor use.[1]

3. Dedicated Pro-Discount & Independent Outdoor Wholesalers

• Minus33 / Ibex: Independent merino-focused technical brands often accommodate small-to-medium outfitters and professional guide operations via direct outreach to their wholesale/commercial departments. They provide sturdier, traditional heavyweight 250–400 gsm options ideal for cold-weather guiding without the massive corporate overhead of conglomerate brands.

To help narrow down the best path, let me know:

• Are you looking for off-the-shelf branded gear with your logo , or unbranded bulk manufacturing?
• What fabric weight (GSM) and quantities do you need?

For guide companies, search-and-rescue teams, and heavy outdoor operations requiring bulk or custom-branded merino wool base layers, sourcing typically falls into three main avenues: established retail brands with corporate/pro programs, specialty promotional outfitters , or OEM/factory-direct manufacturers for custom specifications.

1. Major Retail Brands (Corporate Sales & Pro Deals)

Many top-tier outdoor brands do not sell "blank" bulk stock through a traditional industrial catalog, but they accommodate guide services, ski patrols, and corporate teams via dedicated Corporate Sales or Pro/Guide Programs.

• Smartwool: Famous for their robust midweight and heavyweight (250g+) merino tops and bottoms. They run an extensive Smartwool PRO Program for qualified outdoor professionals, alongside dedicated corporate sales for team branding.
• Icebreaker: Renowned for pure, high-durability merino (such as their Oasis 200g and 260g series). While retail-focused, they partner with specialized outdoor promotional distributors (like Elite Promo) to supply co-branded or embroidered merino beanies, base layers, and mid-layers in minimum quantities.[1][2]
• Helly Hansen: Known for their award-winning LIFA Merino tech, which fuses a 100% polypropylene inner wicking layer with a 100% merino wool exterior. They have major corporate/promotional channels (via partners like Corporate Gear and SwagHQ) allowing customized team logo placement on technical mid- and base layers.[1][2][3]

2. Specialized Outdoor Uniform & Promotional Distributors

If you need guaranteed volume pricing, custom logo embroidery/screen-printing, and streamlined team ordering without going direct-to-factory overseas, promotional distributors that specialize in top retail brands are the most efficient route:

• Corporate Gear / SwagHQ: Stock bulk technical garments from brands like Helly Hansen and Icebreaker, offering volume tier-pricing and customized branding tailored to active outdoor staff.[1][2][3]

3. OEM / Factory-Direct Custom Manufacturers (Private Label / True Bulk)

If a guide outfit or larger organization wants to design custom-weight micron counts (e.g., ultra-durable 19.5 to 21-micron merino blended with nylon/core-spun for heavy abrasion resistance) with completely custom colorways and logos:

• Alibaba / Global Sources Verified OEMs: Numerous specialized knitwear and technical apparel factories in regions like Inner Mongolia and Zhejiang (traditional wool hubs) offer wholesale OEM/ODM manufacturing.[1]
• What to look for: Filter strictly for suppliers providing ZQ-certified or Responsible Wool Standard (RWS) merino, and request core-spun merino (where merino fibers are wrapped around a nylon filament) rather than 100% pure-spun merino, as core-spun drastically increases tear strength and longevity for rugged, heavy outdoor guide use.

If you'd like, let me know:

• The approximate quantity you need (e.g., 10 uniforms vs. 200+ units)
• Whether you require custom logo branding/embroidery
• Your preferred fabric weight (e.g., lightweight 150g vs. heavy-duty 260g+)

I can help narrow down the best specific supplier or program for your team.

Yes. For guide companies, outfitters, ski operations, hunting/outdoor crews, and other high-use programs, I’d separate the market into established wholesale brands and true OEM/ODM manufacturers.

Best manufacturers/suppliers to investigate

• minus33.com — U.S. / New Hampshire

• Probably one of the most interesting options if you want durable, relatively straightforward 100% Merino base layers rather than fashion-oriented apparel.

• They have an actual wholesale program, and their manufacturing background goes back five generations. They also list Woolmark, OEKO-TEX and RWS credentials.

• Their range includes very heavy 400 g/m² expedition-weight pieces, which is unusually appropriate for guides working in genuinely cold environments.

• Their contract-manufacturing listing indicates an MOQ around 1,000+ units for custom work.

• apexapparels.in — India

• A strong candidate if you're looking for custom/private-label production rather than simply buying an existing brand.

• They knit and dye Merino fabric in-house and offer pure Merino as well as Merino/nylon, polyester, Tencel and cotton blends. They specifically discuss reinforced construction, flatlock seams and long-wear outdoor applications.

• They report RWS, Woolmark, OEKO-TEX, GOTS and Sedex credentials and quote roughly 8–12 weeks for bulk production after development.

• welovetheearth.net — China

• Worth contacting for a purpose-built guide-company garment.

• They specialize in Merino OEM/ODM, including base layers, and offer fabric sourcing, development, sampling and bulk manufacturing. They report RWS, Woolmark, OEKO-TEX, GRS and BSCI credentials.

• Particularly interesting because they can build blends such as Merino/nylon or Merino/polyester when abrasion resistance matters.

• spftex.com — China

• A good candidate for higher-volume private-label programs.

• They offer OEM/ODM, Merino thermals, seamless products and private labeling. A 2026 industry listing reports MOQs of roughly 300 pieces for cut-and-trim and 500 for seamless/socks, although I'd verify those numbers directly with the factory.

• I'd specifically ask them for current RWS documentation rather than relying solely on marketing claims.

• sansansports.com — China

• More of a factory-direct private-label option.

• They specifically manufacture Merino base layers and thermals and advertise flexible MOQs, including small initial orders, with substantial production capacity.

• Potentially attractive if you're testing a program before committing to thousands of pieces.

• crownway.net — China

• Worth considering for large outdoor-program orders.

• They manufacture base layers for outdoor brands, retailers and ski resorts and have experience with Merino blends and high-volume production.

What I'd specify for guide-company use

For something that will be worn day after day, washed frequently, and abused by professional guides, I wouldn't automatically choose 100% Merino.

I'd get quotes on at least these three constructions:

The third option is particularly interesting. A nylon core or modest nylon percentage can substantially improve abrasion and tensile durability while retaining much of Merino's odor/temperature-management advantage. Even Smartwool's current All-Season construction uses Merino around a nylon core specifically to improve durability.

For heavy winter use, I'd also ask about 300–400 GSM Merino. Minus33, for example, currently offers a 400 GSM 100% Merino expedition crew.

If you're outfitting an actual guide operation

My first three calls would be:

1. Minus33 — if you want a proven U.S. supplier and can work with their existing product platform.
2. Apex Apparels — if you want your own specification/label and a serious technical garment.
3. Wildlander — if you're looking for factory-direct OEM production and want to optimize the fabric/construction around your use case.

I'd give each manufacturer a specification such as:

200–220 GSM, 17.5–18.5 micron Merino; men's and women's; long-sleeve crew; flatlock seams; reinforced shoulder/underarm; low-profile cuffs; machine washable; mulesing-free/RWS wool; black/navy; woven logo; approximately X units/year. Then have them quote 100% Merino vs. Merino/nylon, because the latter may prove much cheaper over the life of a guide's garment.

If you tell me roughly how many units you're buying (e.g. 100, 500, 2,000, or 10,000+) and whether you need your own logo/label, I can narrow this down to the best 5–8 manufacturers and compare MOQ, country, certifications, GSM, custom options, and likely price tier.