Stay cozy and comfortable even when the weather is cold with the ActionHeat(TM) Wool Battery Heated Socks. These socks feature built-in heating panels that are powered by three AA batteries per sock so you stay warm when it's cold out. ActionHeat heating panels provide you with up to 8 hours of warmth, while ActionWarmth(TM) fabric helps to provide insulation and comfort making them ideal for working outdoors, camping trips and more. 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 Estimated Heating Times: Heats up to 130F for up to 4+ hours Includes: (2) ActionHeat Wool Blend Socks (2) AA Power Packs; Each Require (3) AA Batteries (Batteries Not Included) Specs: Built-In heating panels strategically placed on the top of the toes use advanced ultra-fine fibers to provide superior heating performance Battery Voltage: 4.5 Volt Power Packs Power System: AA Batteries (not included) Colors Available: Black Recommended hand wash only. Note: Can use mesh wash bag for gentle machine wash Heats 4+ Hours Unisex Fit