The Fjallraven Nordic Heater can withstand both polar climates and biting winds. An extremely warm hat with synthetic fur on the peak, ear flaps and edges. The Nordic Heater's outer material is soft, quiet polyester. Ear flaps can either be folded up and fastened with a button or held in place with a strap under the chin to stay on your head in hard winds. Teflon-treated fabric wards off precipitation and dirt.Material: Outer: 100% polyamide, 100% Acrylic Lining: 100% polyamide Waterproof