Compared with salt and red beans, HydroPearl water pearl granules, the main component of the product, have the advantages of dual cold and hot effects (hot compress or cold compress), quick onset (only heating for 30-60 seconds), repeated use, sterility, no mildew, no allergy, controllable temperature, convenience and rapidity. When hot compress is needed, just put the product on a clean plate and heat it in the microwave oven for 30-60 seconds according to the product instructions, and then start comfortable warm steam hot compress physiotherapy. When cold compress is needed, put the product in the freezer for more than 2 hours to experience soft and skin-friendly anhydrous cold compress.