Craft Sportswear Men's Active Extreme Long Sleeve Base Layer Athletic Training Fitness Shirt: cooling/sport/bike/ski/run/sun/protection/top 100% Polyester Imported Protects your body in fair and windy conditions Craft is the official apparel and footwear sponsor of Spartan Race Jersey with elastic Wind stopper panels, ergonomic fit, and flatlock seams Ergonomic fit and superb drying effect Hexa-channel fiber against the skin enhances moisture transport to cools the body down Flatlock seams that follow body movements