Welcome to the most powerful heated sock on the market! The ActionHeat 5V Premium heated socks have the highest tested performance of all ActionHeat items. The ActionHeat 5V battery heated socks are the perfect blend of quality and comfort. The Rechargeable ActionHeat socks reach a maximum temperature of 150F and can last up to 5 hours. ActionHeat battery heated apparel utilizes innovative technology designed to warm the core body temperature. These revolutionary garments feature built-in heating panels and are made with ActionFlex material that provides lightweight warmth, comfort, and versatility. ActionHeat heated garments use FAR infrared heating and ActionWave heat reflective technology to deliver hours of heat and comfort. ActionHeat allows you to stay warmer and enjoy outdoor winter activities longer than ever before. HOW TO USE: 1. Power Up - Charge the provided ActionHeat 5-Volt batteries. 2. Plug-In - Connect the batteries to the USB cords located in the pocket on the top of the sock. 3. Turn On - Press and hold the touch-button control on the sock for 3 seconds. Press button to cycle through the heat settings. Size: S/M. Color: Black. Gender: unisex. Pattern: Solid. Material: Wool.