Size Guide
Men's Baselayer Sizes
ACCAPI USA's men's infrared compression apparel is engineered for performance and recovery. Our sizing is designed for a snug, functional fit that works with your body's natural movement. Use the measurements below to find your size — when between sizes, we recommend sizing up for a more comfortable fit. Shop our men's collection

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Size Notes: If you find yourself between sizes, we suggest you choose the larger size
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Men's Polar Bear Long Sleeve Baselayer Shirt | Extra Warm Hollow Fiber
Men's Polar Bear Long Sleeve Baselayer Shirt | Extra Warm Hollow Fiber
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Nature-Inspired Warmth for Extreme Conditions
The Men's Polar Bear Long Sleeve Baselayer Shirt takes its cue from one of nature's best cold-weather survivors. Hollow-fiber polyester construction mimics the insulating structure of polar bear fur, delivering extra warmth without added weight — perfect for skiing, snowboarding, cross-country, and cold-weather days outdoors.
Hollow Fiber Insulation Thousands of microscopic air pockets within the hollow-fiber polyester lock in body heat while allowing moisture to escape. The result is consistent warmth, excellent breathability, and a dry, comfortable feel from first chair to last run.
EQT Equilibrium Technology Accapi's EQT technology is tuned to your body's equilibrium, enhancing stability, balance, and proprioception. Whether navigating a technical ski run or a nordic trail, you'll notice improved agility, faster postural response, and better circulation.
EXS Ultra Extensible Technology Seamless flatlock construction combined with EXS ultra-extensible technology delivers four-way stretch and a body-mapped fit. Freedom of movement is total — no restriction at the shoulders, elbows, or torso, no matter how demanding the activity.
Key Features:
- Extra warm hollow fiber insulation
- EQT Equilibrium Technology for balance & proprioception
- EXS ultra-extensible seamless flatlock construction
- Excellent breathability & moisture control
- Lightweight with minimal bulk
- Made in Italy
Thermal Rating: Extra Warm | 49% Polyamide, 47% Polyester, 4% Elastane | Made in Italy
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