{2021 UPGRADE, LARGE AREA HEATING WIRE} Large Area Heating Wire Makes Socks 2 Times Warmer Than Other Socks. Our Heated Socks Hidden Heating Wire Covers 80% Of The Sole Of The Foot And Is Integrated With The Socks To Heat Evenly And Incredibly Warm {RAPID HEATING} The Invisible Heating Wire Can Be Heated Quickly Within 5s, Which Can Give The Legs Extra Heat In The Cold Winter. Suitable For Camping/Skiing/Motorcycle/Winter Outdoor Sports. {SOFT AND THICK BUT WASHABLE} This Thick Mixed Cotton Fabric Has An Ergonomic Curve Design, Breathable And Flexible, And Can Be Washed By Hand And Machine. {3 MODE ADJUSTABLE} It Has 3-Speed Adjustable Temperature, The Lowest Is About 113F (8-9 Hours), The Middle Temperature Is About 131F (5-7 Hours), And The Highest Temperature Is About 149 F (3-4 Hours). The Temperature Can Be Easily Adjusted According To The Environment And Weather Conditions {HEART-WARMING GIFT} THE BEST GIFT FOR WINTER: Socks are an ideal winter gift for family and friends. Please fully charge the battery before use (when the voltage is too low, it will take a while to charge the light before turning on)