Hot Chillys Men's Pepper Body Fit Crew Warmth Factor 7Base layering is a fundamental component to keeping warm and staying dry. This stretch fit wicking crew features the best moisture management and high tech fabrications. Whatever the season or activity, from snowboarding, climbing, skiing, snowshoeing, cycling, to running or indoor fitness classes at the gym, Hot Chillys Thermals are the smart choice.Fabric:Micro Denier MTF Polyester, SpandexFinish:Flat seam construction, Added stretch for maximum comfort, Breathes easily while providing exceptional moisture managementFeatures:Quality five thread flat seam construction, Lightly sanded for added warmth and exceptional feel, Moisture managing properites,Peachskins:Gives you the performance you are looking for while feeling like silk. Rated a 7, they are perfect for layering. The super soft fabric is also great at managing moisture which keeps you dry. Hot Chillys has revolutionized the ski market with performance ski ?warm wear? (base layer underwear) by incorporating fabric technologies previously found primarily in running apparel. We use technologies that include moisture wicking and moisture management, anti-microbial protection, and superior construction techniques. Each season we take new and updated fabrications and apply them to our performance apparel to offer the latest moisture management innovations.