Thank you for viewing our products. Instant purchase is OK. Thank you. [High-Quality Down - Promises Comfortable Temperature] Naturehike shoe covers are made with 90% high-quality white goose down, free of odors and impurities. Not only are they light and soft, but they also have excellent heat retention with a 700FP (fill power) rating. The outer fabric uses strict 20D 400T nylon, providing waterproof functionality and good durability, preventing feather leakage. Furthermore, the high-quality material is gentle on the skin. [Ultra-Lightweight & Compact] Naturehike ultra-lightweight down shoes are light and can be folded small, and come with a waterproof storage bag, making them very convenient to carry at home or when traveling. Hand washing is recommended for care. They can be washed completely, allowing for hygienic use. [Product Specifications] S size: Expanded size: 26×12×23cm, Storage size: 13×9cm, Weight: Approximately 80g (including storage bag). M size: Expanded size: 29×15×23cm, Storage size: 14×9cm, Weight: Approximately 90g (including storage bag). Applicable temperature: 0-15°C. [Applicable to Various Places] Great for telework, indoor wear, naps, mountain climbing, tent stays, car camping, travel, business trips, and welcoming guests at home. Perfect for those who tend to have cold feet, and the best solution for winter foot care.