Intelligent electric heating underwear set. Intelligent temperature control, 8 carbon fiber heating elements heat the core body parts, heating the shoulders, chest, abdomen, waist, hips, elbows, thighs and calves. usb charging: electric underwear with usb port, can be powered by any 5v or 2a usb portable charger. the usb plug is compatible with most portable chargers on the market. It can start heating in 30 seconds with long duration and long heating time. Note: There is no power bank temperature control. Insulated heated underwear can be charged and the temperature can be adjusted in 3 levels to adjust the desired temperature by the indicator light. Washing instructions: machine washable or hand washable. If the electric ski underwear set is machine washable in winter, please wash the men's sports baselayer in a laundry bag. To ensure the life of your clothes, try to avoid strong washing and hang dry normally. Rinse with water after washing and do not wring. Let it dry naturally. Multifunctional-heated underwear helps improve blood circulation and enhance metabolism. It is very suitable for people who are afraid of cold, Raynaud's disease, arthritis, poor blood circulation and stiff joints. Our USB heated men's thermal underwear set is a perfect gift for the elderly, lovers or friends. It is the best Thanksgiving and Christmas gift.