Heated thin liner made of , very soft Lycra with breathable fleece on the inside. It absorbs moisture to keep your hands dry and warm. This thin liner can be worn under other gloves without adding bulk. The battery powered liner uses 7.4V 2200MAH Rechargeable Liion Batteries. A large capacity battery provides longer runtime and can power the heated gloves for up to 6 hours on a full charge. For extended outdoor activities or sports, consider extra batteries (sold separately). It features a 3heatsetting controller for easy temperature adjustment. Upgraded to use far infrared fiber heating elements that cover the whole back of the hand and fingers. This can stimulate blood circulation and is especially beneficial for Raynaud's disease, arthritis, poor circulation, stiff joints and frostbite affected hands. It helps reduce the sensation of cold hands. Electric glove liners with touch sensors on the forefinger and thumb allow you to use smartphones without removing the gloves. Stay warm and stay connected. Use scenarios Ideal for winter commuting and outdoor tasks such as hiking, snow shoveling, or other activities where hands need long lasting warmth. Runtime up to 6 hours on a full charge. Beneficial for people with circulation issues such as Raynaud's disease, arthritis, or frostbite prone hands, helping to improve warmth and comfort through improved circulation. Convenient for outdoor use with touch screen devices, enabling phone calls, navigation, and messaging without removing gloves.