Hot Chillys Men's Mirco-Elite Chamois Panel Zip-Tee A blend of MTF (Moisture Transfer Fiber) micro polyester, Bio-Silver antimicrobial polyester and spandex for the ultimate functionality Designed with panels for a look that can be worn alone or layered Zip-through collar construction for ultimate warmth Flat seam construction reduces bulk and abrasion Anatomical body fit design allows for freedom of movement