EMPIRELION Thermal Sports Beanie 4-way high stretch knitting fits all head circumferences, fits head contour closely without squeezing skull; Foldable ear protection brim design, freely switch single warm wear and full ear windproof wear, guard auricle from cold frostbite during long-time outdoor training; Low-profile streamlined shape, compatible with football helmet and sports goggles, no bulging interference for on-field wearing.