Cycling Bicycle Bike Sweat Proof Hat Headband Riding Outdoor Sports Pirate Cap Scarf free-Size The material is dry fit so it isn't heavy feeling or hot. Lightweight fabrication,This hat can be wear on the sensitive scalp of someone who had lost hair due to medical treatment. None of the irritating rub that some hats can cause. Easily fits under motorcycle helmet,baseball cap,This head cover can losing heat by evaporation,shield your head from sun coming through slots in your bicycle helmet This cap stretches easily ,you can tie this cap only as tight as you are comfortable with . It is suitable for male and female,comfortable for small head and big head. Machine washable, air dry, does not shrink.