Heated thin liner are made of high quality and very soft Lycra, and the inside with breathable comfort Fleece. It can absorbs moisture to keep your hands dry and warm.This thin line can wear with other gloves and not clunky at all.The battery glove lines with 7.4V 2200MAH Rechargeable Li-ion Batteries. Large capacity battery can keep more electric and can let the heated gloves work up to 6 hours(full charged).If doing sports or work in outside long time,suggest to buy extra batteries(sold separately). Heated glove liner with 3 heat setting controller for you adjust the temperature easily.This rechargeable glove liners upgraded to use far infrared fiber heating elements covers whole back of hand and fingers.It can stimulate your blood circulation, especially good for Raynaud's disease, Arthritis, Bad Circulation, Stiff Joints and Frostbite hand people.Say bye-bye to cold hands.All our heated products have perfect after sales service support. If you have any questions about quality, size, battery or charger, please e-mail us, we are ready for personally help you.