1. This down booties is made of nylon as the surface material, which effectively prevents moisture, waterproof and keep your feet and toes flexible. 2. 90%white goose down, 700 filling power, keep your feet warm in cold winter(Comfy Temperature: 0-15 °C/ 32-59°F). 3. Weighing only 80g, super lightweight and portable, it is comfortable to wear without adding any burden to your feet, allowing you to walk easily and freely. 4. Suitable for various outdoor activities such as camping, hiking, skiing, etc., providing you with comfortable foot protection. 5. Material: 410T nylon + goose down lining. 6. Size: S- 26*23cm/ 10.24*10.05in ; M- 29*23cm/11.41*9.05in 7. Weight: 80g/ 2.82oz