This slippers are made from breathable nylon fabric and duck down filler to keep your feet warm in cold winter, very suitable for both indoor and outdoor use.Features:Nylon shell fabric is breathable and water-resistant.Duck down filler keeps your feet warm and comfortable.Elastic band provides a snug fit and keeps out the cold wind.Comes with a storage bag for easy carrying.Suitable for home, outdoor camping, hiking, backpacking, etc.Specifications:Material: 20D 400T Nylon + Duck downComfort Temperature: -15 ~ 0Color: Black / Blue / Red (optional)Size: M / L (optional)M for foot size EU36-41L for foot size EU39-44Package Size: Approx. 18 * 13cm / 7.1 * 5.1inWeight: Approx. 90g - 100g / 3.2oz - 3.5ozPackage List:1 * Pair ofSlippers1 * Storage Bag