This is a new type of electric heating thermal underwear, powered by a conventional 5v2A power bank. Through the built-in electric heating element, electrical energy can be converted into heat energy, providing additional warmth for the knees and waist. The level of heat can be adjusted. It features high-elasticity fabric and a flannel lining, offering excellent insulation and comfort, making it a new choice for keeping legs warm in winter. Note that the power bank is not included. This is a new type of electric heating thermal underwear, powered by a conventional 5v2A power bank. Through the built-in electric heating element, electrical energy can be converted into heat energy, providing additional warmth for the knees and waist. The level of heat can be adjusted. It features high-elasticity fabric and a flannel lining, offering excellent insulation and comfort, making it a new choice for keeping legs warm in winter. Note that the power bank is not included. This heated thermal underwear, as our flagship product this year, has been carefully refined for 3 years. After repeated experiments and tests, we have finally solved the common problems of low heating temperature, short usage time, and easy damage on the market. Ultra-fine flannel The pants are lined with flannel, soft, skin-friendly and warm Graphene heating sheet Up to 18 hot zones The size is slightly smaller, it is recommended to take one size larger Height 67 inches, weight 160-180 pounds, choose L size Height 69 inches, weight 180-200 pounds, choose XL size