Craft Sportswear Men's Zero Active Long Sleeve Crewneck 100% Polyester Imported HEXA channeled fabric (six channels) against the skin enhances moisture transportation, cooling the body Craft is the official apparel and footwear sponsor of Spartan Race HEXA channeled fabric (six channels) against the skin enhances moisture transportation, cooling the body|Hollow fiber on the outside of the fabric offers insulation and transports moisture to the next layer|NULL|Flat lock stitching prevents chafing,raglan shoulders for free arm movement,long torso for full coverage|