●Wearing a bike hat can effectively prevent sweat and rain. headaches caused by cold air. ●Back elastic adjustment 《56-61(CM)/20-24(INCH)》.Weighs less than 1oz. will be more comfortable to wear. ●Our stores cycling hats are available in a variety of styles and are easy to fold and carry. ●The flexible brim is designed to fit easily into a riding helmet. It will also maintain a handsome image when you take off your helmet. ●You can get a full refund straight away if youre not satisfied within a year.Corsehild are confident enough about cycling hats to entice you!