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 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 method: 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 does not have a 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).