UPGRADE INVISIBLE HEATING DESIGN and ELEMENT - Our heated socks hidden heating wires covers whole toes area and integrated with socks. These heated socks are equipped with premium alloy heating wire instead of the traditional carbon fiber wire, the heating elements all around both fore foot and instep, evenly heated, temperature stability characteristics.2PCS 3.7V 4000mAh RECHARGEABLE BATTERIES - The rechargeable heated socks are equipped with two 4000mAh Large Capacity Battery, providing you with 12-16 hours enduring warmth, used twice than traditional 2300mAh battery.3 HEAT SETTINGS - The heated socks are designed with 3 heat settings, including high heat(155-160, 8.5-9 hours), medium heat(140-150, 12-12.5 hours), and low heat(115-120, 15-16 hours) make these electric heated socks ideal for keeping your feet warm in winter.FIT MANY OCCASIONS - The heated socks are suitable for all kinds of outdoor sports, such as skiing, snowboarding, hiking, camping, climbing, trekking, hunting, fishing, cycling, skating, motorcycling, equestrian, and so on. You can wear them as home slipper socks, daily casual socks or athletic outdoor trail cold weather gear in Spring, Fall, Winter season or in any cold weather areas or snow areas..