A layer of foam encased within the brim allows the Stream Bucket to float on water in case this bucket hat decides to go for a dip.off, the moisture wicking sweatband ensures the wearer's head will never get uncomfortable, and the inner foam brim ensures the hat won't sink to the bottom of a lake. Great for fishing, as well as hunting, gardening, and any other outdoor activity. Made with 100% polyester. Available sizes: S (US size 7-1/8=57 cm), M (US size 7-1/4=58 cm), L (US size 7-3/8=59 cm), and XL (US size 7-1/2=60 cm). Not intended as a flotation device.