COOLIBAR SUN PROTECTION: The world’s leading sun protection company guarantees UPF 50+ that blocks 98% of UVA and UVB rays DERMATOLOGIST ENDORSED: Honored as the first to receive the Skin Cancer Foundation Seal of Recommendation FABRIC: Crafted from 100% Polyester (shell), with a 100% cotton comfort lining. FEATURES: Oversized fit. Fully lined crown for advanced sun protection and comfort. Moisture-wicking comfort sweatband. Travel-friendly, crushable, and packable design. Large 6.5 (15cm) brim for wide angle sun protection. One Size Fits Most- Circumference: 57.5cm (22 5/8) US Size 7 1/4. Adjustable with interior ribbon. DESIGNED FOR: All day exposure to the sun requiring high-level face, head, ear, and neck coverage. Perfect for leisurely days by the coast, weekend getaways, and everyday sun protective casual wear.