The ActionHeat 5V Classic Heated Socks are designed to provide reliable warmth and everyday comfort in cold conditions. Built with integrated heating panels, these socks deliver consistent heat while maintaining a comfortable, flexible fit for all-day wear. HOW TO USE: Power Up - Charge the provided ActionHeat 5-Volt batteries. Plug-In - Connect the batteries to the USB cords located in the pocket on the top of the sock. Turn On - Press and hold the touch-button control on the sock for 3 seconds. Press the button to cycle through the heat settings. Features: Built-In heating panels strategically placed on the sole of the foot use advanced ultra-fine fibers to provide superior heating performance Heat-trapping fabric provides maximum warmth, comfort, and versatility. Touch-Button Control Technology (3 settings) Battery Voltage: 5 Volt Machine Washable using the provided mesh wash bag only (gentle cycle) Heats 5+ Hours Unisex Fit Estimated Heating Times: High (Red): 150F - 3+ Hours Medium (White): 130F - 4+ Hours Low (Blue): 100F - 5+ Hours NOTE: Recommended to use low or medium settings. High should not be used for more than 5 minutes at a time. Material Contents: Material Content: 67% Cotton, 18% Polyester, 14% Nylon & 1% Spandex Ultra-fine carbon fiber heating panels. Includes: (2) ActionHeat 5V Classic Heated Socks (2) 5-Volt 3000mah power banks (1) Charging Wire