Size: S, 21.5-23cm Material: Pile - Polyester 　　　　Sole - (Outer) Waterproof PVC, 　　　　　　　(Inner) Polyester, Rayon *Please check the product details page for sizing. "Uses moisture-absorbing and heat-generating material" The sole uses rayon, a moisture-absorbing and heat-generating material, to quickly warm your feet. It gently wraps your feet, protecting them from the cold of winter and keeping them warm for a long time. "Waterproof, Soundproof, and Non-slip" The sole uses PVC material, which is non-slip, waterproof, and soundproof, making it gentle on flooring. Also, if the sole gets dirty, you can easily clean it by wiping it with a damp cloth. It's very easy to care for. "Easier to Wear!" The instep has been raised to reduce the feeling of tightness. In addition, urethane sheets have been added to the sole to increase cushioning, so your feet won't hurt even if you wear them for a long time. Lightweight and warm, it's the ultimate in comfort. "Key Features of This Product" 1. Easy care. Hand washing and machine washing are both OK. *We recommend using a laundry net. 2. Anti-static treatment. Effectively prevents static electricity generated by dry skin and products in winter. 3. Moisture-absorbing and heat-generating function. Absorbs sweat and moisture released from the body and converts it into heat. 4. Safe and secure with no formaldehyde.