Features: 1. Application - This is a Disposable Self-heating Insole you can apply it to your shoes. 2. Instruction - Tear the outer packaging bag and take out the product in the inner bag without rubbing it just like the insole and pad it on the sole of the foot. (Avoid using it directly on the skin please wear shoes and socks when using it.) In order to prevent damage to clothing and footwear please carefully check whether this product is damaged before use. In order to better use this product and achieve the best hot compress effect after taking out the inner bag product place it in the air for 3-5 minutes. 3. Attention - This product starts to heat up after unpacking. Please do not open the package when the product is not in use. Do not use when wearing sandals slippers or boots (high temperature will cause the upper to swell). Please pay attention to prevent low-temperature scalds (low-temperature scalds refer to burns that can cause symptoms such as erythema blisters etc. if a heating object higher than body temperature is in contact with the body for a long time) Pregnant women young children people with diabetes people with skin allergies those who are not sensitive to temperature and those who cannot take care of themselves are prohibited. 4. Material - This product is made ofhigh quality materials comfortable and soft to the touch evenly heated iron and warm to the soles of the feet. No fear of cold wind outdoors. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Material: Iron powder + vermiculite + active carbon Average heating temperature : 52 Size: small size 23*7.8cm large size 25*8.5cm Battery: No Color/Style:As the picture shown Application: Package Included choice 1: 1 x Disposable Self-heating Insole choice 2: 1 x Disposable Self-heating Sticker includes: choice 1: 1 x Disposable Self-heating Insole choice 2: 1 x Disposable Self-heating Sticker "