NOTE: These are REPLACEMENT heated socks only. They do not include batteries or chargers. The ActionHeat battery heated socks are the perfect blend of quality and comfort. The ActionHeat socks reach a maximum temperature of 130F and can last up to 4 hours. HOW TO USE: Power Up – Insert (3) AA batteries into each power pack. Plug-In – Connect the power pack to the cord located in the pocket on the top of the sock. Turn On – Press the red power button on the power pack to turn on. Features: Built-In heating panels strategically placed on the top of the toes use advanced ultra-fine fibers to provide superior heating performance Power System: AA Batteries (not included) Colors Available: Black Recommended hand wash only. Note: Can use a mesh wash bag for gentle machine wash. Heats 4+ Hours Unisex Fit Sizes Available: S/M L/XL XXL Estimated Heating Times: Heats up to 130F for up to 4+ hours. Material Contents: Material Content: 70% Cotton & 30% Spandex Includes: (2) ActionHeat Cotton Blend Socks