• Integrated heating element provides full toe box warmth
• Variable temperature control with 4 heat level options for your desired comfort level
• 8 hours of heat per charge!
• Over-the-calf design won't slide down unlike other socks
• Batteries secure comfortably at the top of calf in convenient pockets
• Unique wool/cotton/spandex blend provides combination of warmth and comfort
• Includes 2 rechargeable high capacity 3.7V 4000mAh battery packs
• USB-C output can be used to charge your phone
• Ideal for winter sports, hiking, spectating and chronically cold toes