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 suns 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