MATERIAL:The main material of the product is Silica gel material, rotating bottle cap to prevent leakage of hot water.Explosion-proof and scald-proof using -temperature pressure shaping technology.Can be heated in the microwave. PLEASE FILL WITH COLD WATER AND HEAT FOR NO MORE THAN THREE MINUTES SMALL AND PORTABLE:Size,10.3cm * 16cm,Capacity: 320ml, size suitable for all adults and school children,Gently pour in hot water, make sure the water temperature is not too hot (below 80 C), pour two-thirds of the hot water bottle is better, keep away from children and your own face while watering.WARM HOT WATER BAG COVER:Comforting,gorgeous,removable, washable.Knitted heater for better insulation that scalds the hand with hot water.Available Microwave oven heating.Do not pour in freshly cooked water.Keep children away if you pour hot water in them.MULTIPLE-PURPOSE:Both hot and cold. Hyperthermia: for cold feet, non-inflammatory joint pain, cramps, abdominal pain and period pain. Ice compress: sports sprain, swelling, physical cooling, relieve toothache, cool in summer.WARM GIFT AT COLD NIGHT:Hand Warmer is an ideal Christmas,birthday, year gift for Kid's,girls,boys,men and women parents,friends and your loved ones at long cold winter nights.It can be used to keep warm or treat diseases of the back and the rest of the body.