Craft Sportswear Men's Active Wind Stopper Long Sleeve Base Layer Top 100% Polyester/92% Polyester/8% EPTFE Imported Flatlock seams that follow body movements Craft is the official apparel and footwear sponsor of Spartan Race Ergonomic fit and superb drying effect; a hexa-channel fiber against the skin enhances moisture transport, cooling the body down Thin lightweight and elastic fabric that is channel-knitted with two high-tech polyester fibers Protects your body in fair and windy conditions On the outside, a brushed fiber offers insulation as well as moisture transport to the next layer