The fabric of this Round Hot and Cold Bag is PVC, can be used for both hot and cold, the bag body remains soft below -18 Celsius degrees, and can be used in hot and cold alternating repeated cycles, used for physical cold physiotherapy. To prevent the temperature from being too high or too low, it is best to use a towel or cotton wrap, do not put the bag into the microwave oven for warming without injecting water.
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