HyperKewl 6529-KH-XXXL Evaporative Cooling Vest 60% HyperKewl,40%Nylon Imported Uses Hyperkewl Fabric to cool for 5-10 hours Comfortable V-neck Style with full zipper Will not bulge or change in fit or appearance. No slimy residue or swelling gel or crunchy chemicals Many Size and Color Options