The clothes have a USB interface, please bring your own power bank. Our package does not include a power bank. SIZE CHART: M: length 64cm, chest 104cm, shoulder 42cm, hem 100cm; L:length 66cm, chest 108cm, shoulder 43cm, hem 104cm; XL:length 68cm, chest 112cm, shoulder 44cm, hem 108cm; 2XL:length 70cm, chest 116cm, shoulder 45cm, hem 112cm; 3XL:length 72cm, chest 120cm, shoulder 46cm, hem 116cm; 4XL:length 74cm, chest 124cm, shoulder 48cm, hem 120cm; 5XL:length 76cm, chest 128cm, shoulder 49cm, hem 124cm; Fit and LightweightThe heated vest features waterproof fabric and Quality cotton, Both heat preservation and water resistance, to keep you warm and dry outside. The non-conductive carbon fiber heating flat means you can fold at will. Giving it to your lover, friends, children, parents as a holiday gift. Let love turn into warm to protect you from the severe cold of winter. Multi-scene and Convenient: This men's vest is thin and lightweight enough for you to wear under your winter coat outdoors. You can wear it on skiing, watching athletics, hunting, cycling, fishing, climbing, skating and other activities you like.