Coolibar UPF 50+ Unisex Sunbreaker Running Cap - Sun Protective 100% Polyester Hook and Loop closure UPF 50+ - protects against 98% of UVA and UVB rays Lite SUNTECT: Ultra-soft with a cotton like feel, lightweight, breathable, quick dry performance Removable neck drape for flexible protection and adjustable Velcro sizing tab; Ventilation inserts on sides of crown with removable self fabric chin strap and mesh lining on top inside crown Approx. circumference: (S/M) 22 3/8 inches, (L) 23 inches; Brim: 3 1/4 inches; Hand wash; Imported Recommended for when you want to keep your cool and stay UPF 50+ sun protected while picking up the pace outdoors - includes fitness, basketball, jogging, power walking, cycling, and other outdoor sports activities