Icon X Long-Sleeve for Men. With a body made of lightweight, moisture-wicking, flexible 90% polyester/10% spandex, this fishing shirt feels great. The 100% polyester mesh panels on the sides enhance breathability, and Internal Cooling Element (I.C.E) technology keeps you cool. I.C.E. is engineered at the fiber level to cause an endothermic reaction once you start sweating, causing your body temperature to drop in minutes Body: 90% polyester/10% spandex Mesh Panels:100% polyester UPF 30+ sunproof