16 Inch: Ice pack is the perfect size, 6 inches is usually used for adults to apply on the forehead, face and localized acupuncture points, suitable for children and teenagers to apply on all areas. 2Easy to Use: For cold treatments, easily add ice and water (no more than 2/3) to fill your wonderful ice bag. For hot treatments, simply add some hot water (no more than 2/3), do not boil, 50-60C is best. 3Pain Relief: Hot cold ice pack features a large 5cm/1.97in opening for easy filling with ice or water. The ice pack restricts blood flow, reduces swelling and muscle spasm; the hot pack improves pain and other symptoms. 4Good Performance: Ice bag is non toxic and can be used many times. Soft, waterproof and pliable to hold hot and cold water for long periods of time. Excellent leakproof lid and waterproof design. 5Practical and Convenient: Ice bag is lightweight, small and easy to carry. Hot cold ice pack is perfect to keep in your home, office, car and travel bag to prevent accidental sprains or pain.