Polarmax Thermal Baselayer Warm setting for cool condtions

Dependable, everyday thermal underwear

Polarmax Single Layer

  • Acclimate Dry+ technology moves moisture away from your body.
  • Mechanical Stretch
  • Midweight warmth, relaxed fit
  • In adult and youth styles
  • 100% Polyester; 175 gsm
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Polarmax Warmth Level Warmer for cool to cold conditions

Comfortable and easy fitting for multi-purpose activities

Polarmax Double Layer

  • Our most popular thermal base layers
  • Acclimate Dry fibers for moisture management
  • Double layer traps air between layers for extra warmth
  • Flat seam construction for seam strength and longevity
  • Versatile for sports or everyday warmth needs
  • Mechanical Stretch
  • Midweight warmth, relaxed fit
  • In adult and youth styles
  • 100% Polyester; 150 gsm
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Polarmax Warmth Level Warmer for cool to cold conditions

Ideal for performance sports or casual wear

Polarmax Active Stretch

  • Acclimate Dry hydrophobic yarns
  • Four way stretch
  • Midweight warmth, relaxed fit
  • In adult and youth styles
  • 84% Polyester / 16% Spandex; 180 gsm
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Polarmax Warmth Level Warmer for cool to cold conditions

Comfortable and easy to move in Merino Wool thermal hybrid

Polarmax Merino Wool

  • Acclimate Dry hydrophobic yarns
  • Odor Blocking
  • Four-way stretch
  • Midweight warmth, relaxed fit
  • In adult styles
  • 67% Polyester / 28% Merino Wool / 5% Spandex; 175 gsm
Shop Merino Wool
Polarmax Warmest Icon for warmth in cold conditions

Easy to layer, lofty stretch micro fleece for colder conditions

Polarmax Microfleece

  • Billowy warmth without weight
  • Acclimate Dry hydrophobic fibers for moisture management
  • Exceptionally durable microfiber polyester
  • Flat seam construction for seam strength and longevity
  • Smooth outside, brushed fleece inside
  • Four-way stretch
  • Heavyweight warmth, active fit
  • In adult and youth styles
  • 92% Polyester / 8% Spandex; 220 gsm
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Polarmax Warmest Icon for warmth in cold conditions

Soft, breathable fleece warmth built for cold-weather comfort

Mountain Fleece

  • Our warmest fleece is brushed on both sides
  • Breathable construction helps regulate body temperature
  • Comfortable warmth without bulk
  • Ideal for work, travel, and everyday cold-weather wear
  • In adult and youth styles
  • 100% Polyester; 205 gsm

Shop Mountain Fleece

Product Comparison

Collection
Warmth
Weight
Stretch
Best For
Not Ideal
Collection:Single Layer
Warmth:Light
Weight:Lightweight
Stretch:Mechanical Stretch
Best For:Cool conditions, mild activity, standalone or layered
Not Ideal:Very cold or stationary conditions
Collection:Active Stretch
Warmth:Medium
Weight:Midweight
Stretch:Four-way / High-mobility
Best For:High-movement cold-weather activity, skiing, snowboarding, outdoor work
Not Ideal:Low-output stationary use or extreme cold where warmth is top priority
Collection:Double Layer
Warmth:Medium
Weight:Midweight
Stretch:Dual-layer
Best For:Sustained cold, moderate activity, layering under outerwear
Not Ideal:High-output activity, mild conditions, lightweight-only preference
Collection:Merino Wool
Warmth:Medium
Weight:Midweight
Stretch:Four-Way / Natural Stretch
Best For:Cold conditions, moisture management, odor control, multi-day wear
Not Ideal:Heavy-duty work use or warm weather
Collection:Micro Fleece
Warmth:Medium-High
Weight:Midweight-Heavy
Stretch:Four-way / Flexible
Best For:Moderate to high-output activity, layering under shells
Not Ideal:Very cold, low-output conditions needing maximum insulation
Collection:Mountain Fleece
Warmth:Maximum
Weight:Heavyweight
Stretch:Mechanical Stretch
Best For:Very cold conditions, low-to-moderate activity, all-day warmth
Not Ideal:High-output or dynamic activity requiring maximum breathability