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 down Comfort Temperature: -15 ~ 0 Color: Black / Blue / Red (optional) Size: M / L (optional) M for foot size EU36-41 L for foot size EU39-44 Package Size: Approx. 18 * 13cm / 7.1 * 5.1in Weight: Approx. 90g - 100g / 3.2oz - 3.5oz Package List: 1 * Pair ofSlippers 1 * Storage Bag