Heated carbon glove liners give you warmth right down to your fingertips. The red fabric indicates where the heat is located in the liner. They are made of stretch polyester for a better hand-width fit. Finger length is not stretchable.

They should be used in gloves or mittens. The better insulated gloves or mittens you use, the better performance you'll get.

The rechargeable lithium-ion battery is 12 volts DC, 5200mAh. It has a built-in controller with 4 intensity levels.