UPF50+ certified sun protection against ultraviolet (UV) radiation produced by the sun. Samples of fabrics tested for UV protection in accordance with the international standards. A behind-the-head elastic band providing the right fit for different head sizes. Built-in inner band to wick sweat and water away to improve comfort and ensure dry feeling. Prevents overheating and improves comfort by transferring moisture vapor away from the body through the fabric. Crown and brim: 90% Polyester 10% Elastane, Inner sweatband: 100% Polyester Product Code: 125332. 707. 20. 00