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.Antimicrobrial Protection - Thermotech Extreme contains Ciba TINOSAN, an antimicrobrial protection built into the fibers. It provides long lasting freshness by reducing odors & inhibiting the growth of bacteria - wash after wash.