Material: Gel bag (made in Japan): Water, multi-costed alcohol, polymer absorbent resin, polyethylene, Cover (made in China): polyester, polyurethane; Size: W 3.7 x H 4.3 x D 0.9 inches (95 x 110 x 23 mm); Weight: 4.6 oz (135 g) (per piece); How to use: (1) Turn the cover and insert the opening in the gel bag inside out. (2) Turn it back and place it in a plastic bag and chill it for more than 4 hours in the freezer. (3) Attach it to areas where you want to cool down such as the sole of your foot (arch). Note: The contents of the gel bag cannot be eaten. In the event that you eat the contents, please bring this product and package to consult a physician. If you feel it too cold, please attach it to the top of the sock. Please do not use if you cannot determine it is too cold for yourself. If you experience any abnormalities during use, stop using and consult a physician. If the contents enter your eyes or on your skin, rinse with water. If you experience any abnormalities, stop using and consult a physician. If you have cardiovascular diseases (hypertension, hypo pressure, narrow, etc.), consult a physician before use. Please do not walk while wearing it on the soles of your feet, impact strong or let it touch sharp objects. When putting it in a freezer, please put it in a plastic bag, etc. (If you put it aside, it may cause frost or odor in the freezer to stick). Please do not pull or pull it down. Please use a net when washing the cover. Others: The cooling time may differ depending on the outside temperature and body temperature. When disposing, please follow the regulations of each local municipal government. The color of the cover may differ from the time of manufacture.