Keep your feet warm and cozy during winters fury. ActionHeats Unisex Heated Wool Socks generate heat up to 140F for approximately 10 hours. Strategically placed ActionFlex heating panels with FAR infrared heating and ActionWave heat-reflective technology maximize warmth. ActionWarmth fabric traps body heat, keeping your feet nice and toasty when the temperature drops. Power indicator. 50% wool, 48.5% cotton, 1.5% Lycra spandex. Includes two 3.7-volt, 2.2Ah lithium-polymer rechargeable batteries and one dual battery charger. Imported. Sizes: S/M(5-8.5 Mens; 6-9.5 Womens), L/XL(9-12 Mens; 10-13 Womens), 2XL(12.5-15 Mens; 13+ Womens). Color: Black. Type: Socks.