Thermotech Performance II technical underwear combines moisture management and thermal regulation properties for the active outdoor enthusiast. Thermotech baselayer out performs conventional underwear products and is designed for skiing, snowboarding, hiking, backpacking, cycling and other outdoor activities where staying warm and dry is important. isture Management - Thermotech Performance keeps you warm and dry. Antimicrobial protection inhibits the growth of odor-causing bacteria, keeping you fresher longer. mfort & Performance - Thermotech Performance uses a mid-weight interlock fabric to offer warmth without bulk or heaviness. The garments are cut comfortably loose, enhancing air circulation and creating an insulating air barrier. The smooth, no-abrasive fabric is comfortable while being extremely durable.