Product introduction: Thin shape does not slip in place and fits perfectly to the body and does not lose its style. Perfect for cold weather, keeping the body warm, preventing cold and outdoor sports watching or leisure activities. Caution: Please read before use. Please be sure to protect against low temperatures and burns. Low temperature burns are burned if the heating element is higher than your body temperature for a long time. It may happen without noticing, so please check the condition of your skin from time to time and stop using it immediately if symptoms such as strong redness, itching, or pain. If symptoms do not cure, please consult a physician if they become blisters. ● Children, those with disabilities, those with sensitive skin, or for first time use should be especially careful. Do not use it while sleeping. You wont feel the heat when you sleep and may cause burns at low temperatures. It may also cause high temperature in the bedding. Do not stick directly to the skin. Avoid contact with skin directly. Please be careful when using thin clothing such as underwear. Do not use it in the same location for long periods of time. Stop using when you feel hot. Please do not use this product in conjunction with other heating appliances such as kotatsuri and stoves. There is a risk of sudden heat, bulging or tearing. Do not use this product to prevent blood circulation, such as holding down the heello. People with blood circulation disorder such as diabetes may not feel heat, and may cause low temperature burns. Consult a physician when using this product. Those who are not in good physical condition may not feel heat. Be careful of low temperature burns.