Bontrager Windshell Cycling Skull Cap is fitted with a windshell front panel meaning it gives great protection on windy days. Lightweight thermal fabric traps heat & wicks away moisture. Double layer earflaps help regulate your temperature. Designed to fit comfortably under your helmet & enable layering. Features The windshell front panel is lightweight & has a durable, water-repellent finish Double-layer ear flaps keep ears toasty on cold days The low-profile design allows easy layering under helmets A ponytail port adds long-hair versatility