Smart electric underwear set: Smart temperature control, 8 carbon fiber heating elements heat the core parts of the body, and heat the shoulders, chest, abdomen, waist, buttocks, elbows, thighs, and calves.<br> USB CHARGE: The electric underwear uses a USB interface and is powered by any 5V/2A USB portable charger. The USB plug is compatible with most portable chargers on the market. The heating can be started in 30 seconds, with a long duration and a long heating time. Note: There is no power bank<br> Temperature control: The thermal insulation and heating underwear can be charged, the temperature can be adjusted in 3 levels, and the indicator light is used to adjust the required temperature.<br> Washing instructions: machine washable/hand washable. If the electric ski underwear suit is machine-washed in winter, put the men's sports bottoming shirt in a laundry bag for washing. To ensure the longevity of clothes, try to avoid strong washing and dry them normally. Rinse with clean water after washing, do not wring dry. Let dry naturally.<br> MULTIFUNCTION-heating underwear helps to 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 the perfect gift for the elderly, lovers or friends. The best Thanksgiving and Christmas gifts.