Description of Hot Chillys 9909 Crewneck Technologically advanced to keep you warm and comfortable ...no matter what you’re doing Hot Chillys has led the performance apparel industry for more than a decade with moisture managing base layer technology. When founded in 1985, Hot Chillys revolutionized the ski market with performance ski "warm wear" (base layer underwear) incorporating fabric technologies previously found primarily in running apparel. Hot Chilly engineers the most advanced performance products possible; test and retest for function and durability, then add two parts fun and a cold cerveza. Cuz if you're not having fun, it's just not worth it! Features: Bi-component blend of, 29% Bio-Silver® polyester, 60% polyester, 11% Lycra Moisture transport to keep skin dry and to promote warmth and inherent anti-microbial properties to eliminate bacteria and odor Lightly sanded face for softness and warmth Contoured body fit Flat seam construction for seam strength and to eliminate abrasion UPF rating of 30+ Warmth Factor = 8