INSTRUCTIONS To activate: 1, Flex metal disc back and forth until crystals form. 2, Kneadingthe wrapto soften while crystallising will generate greater heat. To recharge: 1, Boil water in a pot. 2, Place a cloth on bottom of pot. 3, Place theshoulder wrapon cloth inside the pot, and continue to boil water until all crystals are dissolved, and thewrap is completedly clear. 4, When thewrap is completely clear take it out of water and place it on a cloth to cool down. 5, When thewrap cools down, it is ready to be used again. 6, If crystals start forming while thewrap is cooling, repeat steps 1, 2, and 3. More about this product: