Kiribai Kairo Socks - Insole type warmer Shoe-specific warmer Product Name: Disposable warmer Use: For shoes (insole type, for socks) Ingredients: Iron powder, water, activated carbon, absorbent resin, vermiculite, salts Shoe-specific warmer, insole type for socks Maximum temperature: 44℃ Average temperature: 37℃ Duration: 8 hours (measurement value assuming use inside shoes) 7cm x 9cm 2 pieces (1 pair) Expiration Date: 2029.4 2 bags, total 10 pairs Only the contents will be shipped. Please only purchase if you understand this.