Turtle Fur Zuka Ball Cap Lightweight Pocket Packable Anti-Glare Hat Cotton Size: Adult, One Size fits most. Also fits Juniors and Teens 100% Cotton Outer Layer - 100% Polyester Mesh Lining UPF 50+ Sun Protection - Blocks 97% of UV Rays Split Style Visor with hook and loop closure, Air Transport Mesh Lining, Moisture Transfer Sweatband Perfect for hiking, travel and other outdoor activities.