The all new Evo Coldgear from Underarmour bring a totally new technology to providing warmth without the massive bulky feeling you get in other underwear. The secret? Underarmour’s Infrared technology. Coldgear Infrared is a soft thermo-conductive coating on the inner layer of your gear that absorbs and retains your own body heat so you stay warmer longer with no extra weight or bulk.
Evo Coldgear excels in active sports such as hiking, climbing, skiing, cycling, kayaking. Its slick outer texture allows it to easily slide under other layers – giving you great freedom of movement.
Here’s some other info from the UnderArmour site:
COMPRESSION: This ultra-tight, second-skin fit delivers a locked-in feel that keeps your muscles fresh & your recovery time fast.
EVO ColdGear® fabric is ultra-soft and traps warmth for better next-to-skin feel and superior cold-weather comfort
4-Way Stretch improves mobility, maximizes comfort, and maintains shape
Advanced moisture management technology keeps you warm, dry, and comfortable
Anti-Odor technology prevents the growth of odor-causing microbes, keeping your gear fresher, longer
Ultra-brushed interior traps warmth like no other