Gerbing 7V Wool Heated Socks 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. Features: Heats both the top and bottom of your foot Microwire heating throughout the sock liner Moisture-wicking wool blend fabric Special long cut pulls over your calf to fit any boot or shoe Touch-button temperature control Lifetime warranty on the heating elements Estimated Heating Times: High(Red): 140F 3 Hours Medium (White): 120F - 5 Hours Low (Blue): 100F 7 Hours Includes: Two heated socks, two 7V 2,200mAh batteries and one 7V dual charger Note: Manufacturer warns these socks get hot. Please follow instructions and use them carefully.