Sweat can refreeze and make you colder, so don't just keep adding more layers. Give targeted, heat right where you want with our Rechargeable Heated Sock Covers. Our sock covers are thin, breathable, flexible, and provide up to 8 hours of adjustable warmth. Don't get cold feet when it comes to your winter activities! RECHARGEABLE HEATED SOCK COVERS Box: (H) 15.9” x (W) 4.3” x (D) 1.45” / Display: (H) 25.4” x (W) 20” x (D) 7” MODES · High (140°F / 60°C): 4 hours · Medium (131°F / 55°C): 5 hours · Low (113°F / 45°C): 8 hours FEATURES · Rechargeable · Ultra-Thin, Flexible Material (90% Polyester / 10% Spandex) · Use with Any Boots or Shoes · Battery Storage Pocket · Machine Washable ACCESSORIES · USB-A to Dual DC Charging Cable · (2) 2200mAh Batteries