Gerbing footwear has always been known as elite. Whether it's the 12V sock liners, the 3V insoles, or the original 7V Sock Liners, the microwire heating systems have always been the most powerful on the market. Gerbing outdid themselves this time by introducing the Gerbing Ultimate 7V Wool Heated Socks. They feature a full footpad heating system, built discretely into the wool blended knit sock. With the easy-to-use touch-button and slim 2200mah batteries, this is the best-heated sock on the market today. Fit & Design: Heats the entire bottom of your foot Microwire heating elements deliver evenly distributed heat Lifetime warranty on the heating elements Moisture-wicking Wool Blend Fabric Special long cut pulls over your calf to fit any boot or shoe Touch-Button Temperature Control How To Use: Charge Up– Fully charge power bank with provided charger cable Plug-In– Connect the power bank to the plug Turn On– Press and hold touch-button control. Press the touch button to adjust the temperature Estimated Heating Times: High (Red): 140F – 3 Hours Medium (White): 120F - 5 Hour Low (Blue): 100F – 7 Hours Includes: (2) Gerbing 7V Wool Heated Socks (2) Gerbing 7V 2,200 mAh Batteries (1) Gerbing 7V Dual Charger