Equipped with 22 heating zones and 3 heating levels: 22 carbon fiber heating elements generate heat in the core body areas (lumbar, back and neck). This upgraded dual-control 22-zone heated underwear allows you to switch the desired warmth mode with just one touch Our heated underwear will slowly start heating within seconds when powered on. It is widely used in outdoor skiing, winter fishing, mountain biking, cycling, camping, snow hiking, hunting, outdoor attendance, winter streets, daily office, etc., to meet all your needs. Upgraded and designed heating system allows you to enjoy comfortable warmth. Large area carbon fiber wire heater, safe and insulated. Comfortable and skin-friendly, smooth to touch, better warmth retention. Allows you to easily spend the whole winter without wearing bulky clothes in the cold environment. It is powered by USB power. It is recommended to buy a 10000mAh mobile power supply, with a single battery life of more than 7 hours, so that you can feel warm even in extreme environments. Specification: Product name: heating thermal underwear Condition: new Input: 5V Lining composition: spandex Fabric name: cotton Color: black, gray Material: alpaca + spandex Type: Women's, Men's tops and pants, sold separately. Power supply: 5V/2.1A portable power supply not included Size: M L XL 2XL 3XL 4XL 5XL Package includes: 1 x top or 1 x pants