Fleece Underwear and Thermal Baselayers

Key takeaways

Thermal underwear is not one product but a ladder of weights, and the first decision on a tech pack is which rung the garment sits on rather than which fibre it uses.
Microfleece sits at 100-150 GSM and earns its place as a mid-layer, where the job is trapping air without adding bulk under a shell.
Polar fleece at 200-280 GSM is the everyday-warmth standard and the weight most loungewear and basic thermal programmes settle on.
Sherpa at 300 GSM and above is a deep-pile construction built for robes and genuine extreme cold, and it is costed and cut as a different product rather than as a heavier version of polar.
Waffle-knit thermal cotton runs 180-220 GSM and works by structure rather than pile: the waffle creates insulating air pockets while staying breathable enough for skin contact, which fleece is not.
GSM bands overlap between sources, so the specification should name the construction together with an acceptance weight rather than quoting one trusted figure for “fleece”.
Fibre choice sets the complaint profile: polyester fleece pills noticeably less than cotton-blend fleece, which decides how long the garment keeps its surface after repeated washing.
Anti-pill finishing is a separate line and a real upgrade — untreated fleece is where the fuzzy surface that buyers see in returns originates.
Static is the fleece-specific defect: without an anti-static treatment the garment clings in wear and in packing, which is a handling problem as much as a comfort one.
Seam construction matters more in thermal than in standard underwear because the garment is layered — flatlock seams keep the profile flat where an overlocked seam would ridge under outerwear.
Thermal cotton needs compacting to control shrinkage, and its rib-knit cuffs at wrist and ankle are functional elements rather than trim detail: they are what stops heat escaping.
Cutting is the production bottleneck on thick fabrics, so bulk management during spreading and cutting has to be planned as its own step instead of being absorbed into the standard schedule.
Cold-climate programmes are market-specific rather than generically “north”: Russia (products built to EAC requirements), Northern Europe, Canada, the northern US and winter-sports channels each carry their own labelling and testing expectations.
The retail band for thermal that lasts several seasons sits around $30-60, which is the ceiling any fabric or finishing upgrade has to be justified against.

Unitex Underwear (Xiamen Unitex Trade Co., Ltd.)

Fleece Underwear and Thermal Baselayers: OEM Manufacturing for Cold Climates

Thermal underwear is a specialized category with unique manufacturing requirements. For brands serving cold-climate markets, understanding fleece and thermal production is essential. Here’s your guide to thermal underwear OEM manufacturing.

Fleece Types

Key Insight: Fleece and thermal underwear manufacturing requires specialized knowledge: polar fleece (200-300GSM) for everyday warmth, microfleece (100-180GSM) for layering, sherpa fleece (350-500GSM) for extreme cold, and waffle-knit thermal (200-250GSM) for traditional baselayers. Key OEM considerations: polyester fleece pills less than cotton blends, anti-static treatments prevent cling, and flatlock seams prevent bulk in layering situations. MOQ 2,000 pcs per style. Thermal OEM →

Microfleece (100-150 GSM): Lightweight, used as a mid-layer. Polar Fleece (200-280 GSM): The standard for warm loungewear. Sherpa Fleece (300+ GSM): Deep pile, maximum warmth for robes and extreme cold. Anti-Pill Fleece: Treated to prevent the fuzzy balls that plague cheap fleece after washing.

Thermal Cotton

Waffle-knit thermal cotton (180-220 GSM) creates insulating air pockets while remaining breathable. Unlike fleece, it can be worn directly against skin. Cotton-spandex blends add stretch for active use. Rib-knit cuffs at wrists and ankles prevent heat loss.

Key Markets

Russia (products built to EAC requirements), Northern Europe, Canada, Northern US, and winter sports destinations. These markets demand proven warmth ratings and durability. Cold-climate consumers are willing to pay $30-60 for quality thermal underwear that lasts multiple seasons.

Production Considerations

Fleece requires anti-static treatment to prevent clinging. Thermal cotton needs compacting to minimize shrinkage. Both require careful bulk management during cutting due to fabric thickness. Contact Unitex for thermal and fleece OEM; products for the Russian market are built to EAC requirements.

Unitex is based in Xiamen, Fujian Province, and develops these programmes with audited partner factories across the Xiamen–Quanzhou–Jinjiang knitwear cluster of south-east China.

Last updated: 2026-10-21 · Xiamen Unitex Trade Co., Ltd. — OEM & ODM underwear sourcing partner

Sources & references

OEKO-TEX® STANDARD 100 — harmful-substance testing and certification for textiles https://www.oeko-tex.com/en/our-standards/oeko-tex-standard-100
amfori BSCI — social compliance audit programme for supply chains https://www.amfori.org/amfori-bsci
ISO 2859-1 — sampling procedures for inspection by attributes (AQL) https://www.iso.org/standard/2859-1
ISO 6330 — domestic washing and drying procedures for textile testing https://www.iso.org/standard/75934.html
ISO 3758 — textiles: care labelling code using symbols https://www.iso.org/standard/74401.html
Regulation (EU) No 1007/2011 on textile fibre names and labelling https://eur-lex.europa.eu/eli/reg/2011/1007/oj
FTC (US) — clothing and textiles: labelling and advertising guidance https://www.ftc.gov/business-guidance/industry/clothing-and-textiles
CPSIA (US) — consumer product safety improvement act, children's products https://www.cpsc.gov/Regulations-Laws--Standards/Statutes/The-Consumer-Product-Safety-Improvement-Act

Fleece Underwear and Thermal Baselayers: OEM Manufacturing for Cold Climates

Fleece Underwear and Thermal Baselayers: OEM Manufacturing for Cold Climates

Fleece Types

Thermal Cotton

Key Markets

Production Considerations

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Sources & references

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