Microwave heating silicone hot water bag. Hot & cold therapies pain, warm hands, soft environment-friendly material, BPA free, can refrigerator freezing. It can withstand low temperatures of minus 20 degrees and high temperatures of 100 degrees. At the same time, you can relieve stress by pushing the finger pop. But please do not use strongly corrosive liquid to wash the bottle. You can heat the bottle in less than 3 minutes. The microwave heating power must be less than 800W. And do not use the lightwave mode of the microwave oven to heat it. It is very comfortable and convenient to hold on the hand or in the bag. It can be kept warm outside for about 3 hours and kept indoors or in bed for 4-8 hours. Custom logo available.