"You'll hardly feel winter's chill when you wear the ActionHeat 5V Rechargeable Battery-Heated Wool Socks. Built-in carbon-fiber heating panels on the tops of the toes provide strategic warmth that'll keep you going even as the temperature falls below freezing. Plus, the cozy 50% wool/48.5% cotton/1.5% Lycra spandex blend traps heat for even greater warmth. Touch-button controls put you in command of the 3 heat levels. Heat Blast heats up to 150°F for up to 3 hours. Medium heats up to 130°F for up to 4 hours. Low heats up to 100°F for up to 5 hours. Great for skiing, hiking, hunting, and any other cold-weather activity, the ActionHeat battery-heated socks allow you to forget about the cold and focus more on enjoying your time outdoors. Includes 5V lithium-polymer rechargeable batteries and 24"" dual-battery charging kit. Unisex. Hand wash or machine wash in mesh bag on gentle (without batteries). Imported.Manufacturer style #: AH-SK-5V-W. Cozy wool blend traps heat Built-in carbon-fiber heating panels on the tops of the toes Touch-button controls allow you to adjust level of heat Provides up to 150°F Includes rechargeable batteries and charging kit"