QUALITY MATERIAL: The main material of the product is silica gel, with a rotating bottle cap to prevent leakage. Designed to be leak-resistant and durable using high-temperature pressure shaping technology. Safe for microwave heating. NOTE: Fill with cold water and heat for no more than three minutes.SMALL AND PORTABLE: Size: 10.3 cm x 16 cm, Capacity: 700 ml. Suitable size for adults and school-aged children. When filling, use warm water (below 80C), fill up to two-thirds full, and avoid contact with face or children during use.SOFT HOT WATER BAG COVER: Comfortable, stylish, removable, and washable. Knitted cover provides better insulation and helps prevent discomfort from direct contact with hot surfaces. Compatible with microwave heating. Do not use boiling water. Keep away from children when filled with hot water.MULTI-PURPOSE USE: Can be used for both heat and cold therapy. Heat application: helps relieve cold feet, joint stiffness, muscle cramps, abdominal discomfort, and menstrual pain. Cold application: useful for minor sprains, swelling, toothache, and summer cooling.WARM GIFT FOR COLD WEATHER: A thoughtful gift for Christmas, birthdays, or New Year. Ideal for keeping warm during cold nights and providing comfort for body aches. Suitable for men, women, teens, parents, and friends.