Columbia Men's Schooner Bank Cachalot III Hat Shell: 100% Nylon; Lining: 100% Polyester Imported Omni-shade UPF 50 sun protection Omni-wick Shell is 100 percent textured nylon poplin. Lining is 100 percent coolmax polyester Adjustable drawcord and toggle at back Omni-Shade UPF 50 sun protection Omni-wick sweatband and mesh adjustable drawcord and toggle at back