Easy to install, won't mess up or ruin your hairstyle! Ear Muffs / Ear Warmers Color: Boa, Dark Brown Unisex, Size M Sizes: M: 8.5 x 6.7 cm L: 10 x 7 cm Can be worn without getting in the way of headphones, headbands, helmets, or hats. Prevents frostbite on the ears and blocks out sound while studying.