FABRIC: Sprints 5 Panel hats are made with a proprietary blend of featherweight fabric and squisha FIT & SIZE: Each hat is made with a premium snap closure allowing the hat to adjust and fit most adult head sizes. The circumference is 22.8 inches and expands to about 24.3 inches which is a hat size 6 & 1/4 to 7 & 7/8. FIGHT SWEAT: A built in sweat band wicks sweat away from your face and eyes while teardrop mesh vents allow heat to escape keeping you cool on your workout. MACHINE WASHABLE: Wash your Sprints hat on the gentle cycle, in cold water, alone with the Velcro completely closed and hang to dry.