This insole is suitable for keeping warm in winter and guarding against cold and frostbite.There is a damping design on the bottom of heel, which helps relieve the pressure on your feet after a long-time standing. The low arch support design fully integrate ergonomics and humanized design to improve flat feet.There is a yardage cutting line on the sole , so you can cut the insole to the desired size according to the needs. The arch effect is more fit and comfortable.The temperature remote control device is designed. The different buttons on the remote control are used to control different operation modes.The insole can be used when fully charged, with no need to tie batteries or connect to a power supply. Easy to use.Descriptions:Rechargeable Heated Insoles, designed according to ergonomics and humanization, can fully reduce the pressure on your feet and keep your feet warm in the winter.Specifications:Name: Rechargeable Heated InsolesMaterial: velvet and PUVoltage: 3.7VTemperature: 40-60℃Battery capacity: about 2200 mAhHeating time: 3.5 hours at the highest level, 7 hours at the lowest levelCharging time: 3 hoursCan be increased: about 2CM/0.78inCharging method: USB chargingSuitable shoe type: leather shoes, sports shoes, bootsFunction: Warm, heating insoleInsole size: ( can be cut ) female models 35-40 yards/male models 41-46 yardsPacking List:Heated Insoles*1/PairManual*1USB Charging Cable*1Remote Control*1Notes: 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.R