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
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
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
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
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
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
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