The Ear Mitts® Bandless Fleece Ear Muffs work with hoods, hats, helmets, and hair styles. Made with three layers of lightweight fleece, the Bandless Ear Muffs are lined with 3M Thinsulate™ Insulation for superior warmth; and protected with DuPont™ Teflon®. Thinsulate Insulation offers almost one-and-one-half times the warmth of down and twice the warmth of other high-loft synthetics. EarMitts sit comfortably over and around the ear (keeping cold wind out) and mp3 ear buds fit perfectly underneath. The Ear Mitts Bandless Fleece Ear Muffs are the low-bulk way to keep your ears warm.