Coolibar UPF 50+ Men's Convertible Fishing Cap - Sun Protective 100% Polyester UPF 50+ - protects against 98% of UVA and UVB rays Lite SUNTECT&reg;: Ultra-soft with a cotton like feel, lightweight, breathable, quick dry performance; Cooltect&trade; technology accelerates moisture wicking for a cooler day on the water Tuck & zip away neck drape - 5 3/4 inch length (size L/XL), removable self fabric chin strap, and floating foam brim; Brim: 3 3/4 inches; Approx. circumference: 23 1/4 inches (S/M); 24 inches (L/XL); 24 5/8 inches (XXL) Mesh lining and ventilation inserts on sides of crown; Extremely lightweight, travel friendly packable construction; Easy care: hand wash, line dry; Imported Recommended for long days on the water when you need to keep dry and stay UPF 50+ sun protected while sailing, fishing or boating