Material: wool felt, super soft velvet.Features 1: fast heating, heating insole.Features 2 :size can be cut, long life, washable, prevent frostbite.Temperature after heating: 40-45 degrees.Plugs-in method: USB cable (included).Specification:Color: PinkSize: Female S, male MS code application range: US code 4.5-6.5 yardsM code range: US code 7-8.5 yardsPrecautions:1. Unplug the power supply in time after use to avoid prolonged heating and affect the life of the heating sheet;2, Children please use under the supervision of parents3. It is strictly forbidden to connect the power supply with voltage greater than 5V. It is strictly forbidden to use in the unmanned environment.Product Size:S：23*8*0.5cm (Free size 35-37)M：24*8.3*0.5cm (Free size 38-40)Package Included:1 Pair * Heating Insoles1 * USB CableNotes: 1. Only sell main products, not other products.2. Since manual measurement is required, please leave a space of 1-3 cm.3. Due to screen differences, the color may be slightly different from your expected color, please allow.4. This product can be washed with water, remember to dry and heat the insole before using it.5. The elderly and children need to use it under supervision.Remind:After receiving the packaging, please check the packaging and the product carefully. If the received item is defective or has any questions, please contact us via email to resolve the problem. We will reply as soon as possible and do our best to meet your needs!