Waterproof UPF50 bucket cap made from Halley BioDry Discovery Storm cotton fabric. Waterproof interliner and 100% cotton twill lining. Stitched out brim detail. A UPF 50+ hat provides the highest level of sun protection for your head, with the specialized fabric blocking at least 98% of UVA and UVB rays across all covered areas. Unlike regular hats, which can have a low UPF rating (some as low as 5), our tested fabric acts as a reliable, continuous barrier, offering consistent defence during your outdoor pursuits without the need for constant reapplication like sunscreen.