High-quality materialIt features soft and comfortable stretch material,Light, elastic and with good cushioning. Perfect to keep your feet warm in winter. Keep your feet warm in winter for optimum blood circulation in feet. Cuttable SizeThe heating sole can be cut and shaped, 5 mm thick and is suitable for men and women from 41 to 46 sizes. The distance is determined by the dotted line, which is easy and convenient and does not have to worry about the size problem. USB RechargeableMade of high-quality carbon fiber heating material, it is made into soft heating sheet, which has uniform heat generation, high heat conversion efficiency, rapid heat generation and softness. It is an ideal health-care heating material with long service life. The heating sole is used for heating via the USB cable. Safe and reliable Insoles connected to battery pack which contains mesh fabric pouch leg attachment strap,safe and convenient. Even heating, Safe and reliable:high heat conversion efficiency, rapid heating, soft test is an ideal heating material for health care and a long life. Areas of applicationPerfect for outdoor activities skiing, hiking, fishing, cycling, hunting to prevent your feet from cold. Against the cold in the household, outdoor cycling or work in the cold outdoors.