QUALITY MATERIAL: The main material of the product is silica gel, with a rotating bottle cap to prevent leakage. Designed to be leak-proof and safe for use with hot water. Made using high-temperature pressure shaping technology. Can be heated in the microwave. NOTE: Please fill with cold water and heat for no more than three minutes. SMALL AND PORTABLE: Size: 10.3 cm * 16 cm. Capacity: 320 ml. Suitable size for adults and school-aged children. Fill with warm water, ensuring the temperature is not too hot (below 80°C). Fill only up to two-thirds full. Keep away from children and avoid contact with face during use. WARM HOT WATER BAG COVER: Soft, comfortable, removable, and washable cover. Knitted design provides better insulation and helps prevent direct contact with hot surfaces. Compatible with microwave heating. Do not use freshly boiled water. Keep out of reach of children when filled with hot water. MULTIPLE PURPOSES: Can be used for both hot and cold therapy. Heat application: helps soothe cold feet, non-inflammatory joint pain, muscle cramps, abdominal discomfort, and menstrual pain. Cold application: useful for minor sprains, swelling, physical cooling, toothache relief, and summer cooling. WARM GIFT FOR COLD NIGHTS: A thoughtful gift for Christmas, birthdays, or New Year. Ideal for kids, teens, men, women, parents, friends, and loved ones. Provides warmth during cold winter nights and can be used for soothing comfort on the back and other areas of the body.