QUALITY MATERIAL: Made from silica gel material with a rotating bottle cap to help prevent hot water leakage. Resistant to bursting and scalding, formed using high-temperature pressure technology for durability. Safe for microwave heating. SMALL AND PORTABLE: Measures 10.3 cm x 16 cm with a 320 ml capacity, suitable for adults and school-aged children. When filling, use hot water carefully and ensure the temperature is not too high (below 80C). Fill only up to two-thirds full and keep away from children and face during use. REMOVABLE COVER: Features a soft, comfortable, and removable cover that is machine washable. The knitted design helps retain heat for improved insulation. Microwave heating is supported. Do not use freshly boiled water. Always keep children at a safe distance when handling hot water. MULTI-PURPOSE USE: Ideal for heat therapy to help relieve cold feet, non-inflammatory joint pain, muscle cramps, abdominal discomfort, and menstrual pain. Includes two hot water bottles, making them perfect for sharing with family members. WARM GIFT FOR COLD NIGHTS: A thoughtful gift for Christmas, birthdays, or the New Year. Suitable for children, men, women, parents, friends, and loved ones. Provides soothing warmth during cold winter nights and may help relieve minor body aches and discomfort.