The Thermotech® Extreme's technical base layer offers the pinnacle of performance base layer technology. Thermotech® Extreme combines thermal and moisture management technologies with antibacterial protection to provide the ultimate in comfort & performance. Designed with the outdoor enthusiast in mind, Thermotech® Extreme is the premier cold weather base layer garment. Moisture Management - Thermotech® Extreme's construction and fibers allow for the rapid transmission of moisture from the skin through the fabric. Once through the fabric, Thermotech® Extreme's design provides a quick evaporation rate keeping the user dryer and warmer. Comfort & Performance - Thermotech® Extreme's 4-way stretch construction fits snug to the skin providing maximum mobility and comfort during high intensity activities. Thermotech® Extreme's close fit provides exceptional warmth retention while expediting moisture transfer. Thermotech® Extreme always keeps it's shape and remains soft after every washing. Antimicrobial Protection - Thermotech® Extreme contains Ciba TINOSAN, an anti-microbial protection built into the fibers. It provides long lasting freshness by reducing odors & inhibiting the growth of bacteria - wash after wash.