Craft Sportswear Men's Velo Bike and Cycling Full Zip Short Sleeve Jersey: protective/riding/compression/cooling 100% Polyester Imported Body mapped jersey made of 3 different polyester fabrics for enhanced comfort Functional fabric that provides active cooling and great moisture transport Mesh inserts for enhanced ventilation Four back pockets (one zippered) Silicone print at back bottom of hem keeps the jersey in place Craft is the official apparel and footwear sponsor of Spartan Race