Omni-Shade™ 100% textured nylon poplin on top, sides and brim; Omni-Wick™ sweatband and mesh vents; Omni-Shade™ UPF 50 protects you from the sun’s harmful rays; Omni-Wick sweatband and mesh venting actively breathe and pull moisture away from your skin to keep you cool; Adjustable drawcord and toggle at back; Fits most: 21.5" - 24.5"; 3" brim