Bullet points:1, can be cut: can be cut according to the dotted line according to your needs, suitable for all kinds of shoes, 35-46 yards, foot length 230-280mm.2, high heating temperature: 40-55 degree high temperature heating, long service life.3, can be washed in water: can be washed directly without affecting the effect, the material is waterproof, must be completely dried before use.4, Soft and comfortable: heat the entire sole area, heat evenly, soft and comfortable.5, Blood circulation: protect your feet from injury in cold winter, promote blood circulation, with great benefit to the body. Specification: Insert Material: EVA Flexible Fiber Temperature : 40-50 degree according to the environment Suitable size: 35-40 size: 230mm-250mm 41-46 size : 255-280mm (can be cut to the size you want) Voltage: 5V2A2 heating methods: 1. The plug for the house heats up, suitable for sitting.2. Powered by a power bank, it can walk freely outdoors. Packing List:1 * USB Charging Cable1 Pair of EarbudsNote:This heating pad has no battery and cannot store electricity or heat. The insole must be energized to generate heat. It cools down when the power is off. It can also be used with a power bank for outdoor heating. Make sure the output power of the power bank is above 5V/2a. (This product does not include power banks).