This light weight runners hat is made of CoolPlus fiber which lets the air in and moisture out. UPF 30+ sun protection. This hat is extremely light weight and dries quickly. A velcro adjustment strap makes this a one size fits all hat. The mesh strips improve its breathability and coolness. TUGA: UV (UVA and UVB) Protective Swimwear. Lightweight. Dries Fast. Great Fabrics. Exclusive & Cool Prints.