Soft, breathable insulation. This heated insole is made of 80% cotton, 12% polyester, 8% elastane material. Water-absorbing, breathable, quick-drying, elastic and thickened, using electrical modules. A padded, reinforced heel and toe, and recessed heating elements help focus heat on the toes to prevent cold feet.

Easy to control temperature. 3-level setting temperature controller to adjust the temperature to your liking. When fully charged, the battery can last about 5H in the highest temperature mode and about 10H in the lowest temperature mode.

Cozy and comfortable. The upgraded heated sock uses a fiber heating element under the forefoot that continues to provide heat to your foot and can stimulate blood circulation in the foot. It is a good choice for people with cold feet in winter.

Mini lightweight battery. This winter socks can use a 3.7V/2200MAH lithium-ion rechargeable battery for a long service life. Compared to other heated sock batteries, it's smaller and lighter, just put it in the small pocket on the top of the sock while you're using it. You can charge the battery with a USB cable instead of an AC charger.

Suitable for outdoor and indoor use. To keep you warm and comfortable all day, it's perfect for hiking, hunting, ice fishing and the great outdoors in cold weather.