Breathable and Comfortable 90% cotton, 10% nylon, you will feel soft, breathable and comfortable. Heated socks are good for circulating your feet blood and keeping your feet warm in winter.3 Adjustable Temperature 3 adjustable temperature, red light is about 55C, blue light is about 45C and green light is about 40C. The working time with different temperature corresponds to about 5hours, 7hours and 10hours.Rechargeable battery The thermal socks are equipped with a DC port and rechargeable batteries (2200MAH). You can fully charge the batteries for about 2.8 hours and a solid green light will tell you it is fully charged.For Outdoor Activities These electric heated socks are suitable for all kinds of weather activities. cold such as hiking, fishing, skiing, camping etc. Also a perfect gift for Christmas and New Year old people.