Cotton Snug Electric Heated Socks Thick Knitting Thermal Socks Care Chronically Cold Feet Premium quality?`?ade of full cotton material, thick super breathable and wear-resisting.L Size Heated Socks:B07N2LHQQR Long-life performance: Electric heating socks powered with a 3.7V rechargeable Li-ion battery (two batteries included in the package), lasting for 5-6 hours. After the battery runs out, connect it with the charger to the socket, it takes 4-5 hours for fully charged when the light turn from red to green. No more socks! Cleaning method:Recommend hands wash gently. Make sure take out the battery and put socks in a laundry bag before washing. Keep feet warm: Suitable for all kinds of outdoor activities like skiing, fishing, Jogging, hunting, Cycling, hiking and so on, promote blood circulation Perfect gift: Serves as a warm gift for your parents and friends, this is the best choice to keep your feet warm in harsh winter. 100% SATISFACTION GUARANTEE If you have any question about these heated socks like charging or battery issue, please contact us before leaving a review, we will solve it quickly and in the best way!