The clothes have a USB interface, please bring your own power bank. Our package does not include a power bank. Three temperature adjustable SIZE CHART: S: back length 61cm, chest 98cm, shoulder 35.5cm, hood height 30cm, hood width 23cm; M: back length 63cm, chest 102cm, shoulder 38cm, hood height 30cm, hood width 23cm; L: back length 65cm, chest 106cm, shoulder 39.5cm, hood height 30cm, hood width 23cm; XL: back length 67cm, chest 110cm, shoulder 41cm, hood height 30cm, hood width 23cm; 2XL: back length 69cm, chest 114cm, shoulder 42.5cm, hood height 31cm, hood width 24cm; 3XL: back length 71cm, chest 118cm, shoulder 44cm, hood height 31cm, hood width 24cm; LIGHTWEIGHT & STYLISH- Say Goodbye to Bulky Clothes The down-filled is designed to make the heated vest lightweight, fluffy, and non-constricting feel. Lightweight construction and wind and water resistant fabric ensures you can enjoy exceptional warmth, no restriction on wearing during sports. Moreover, it can be easily layered with other clothing for added flexibility in styling options. Suitable for walking the dog, running, cycling, skiing, or hunting in colder weather. WARMING GIFT The electric heated vest for men women will hold the whole day warm and comfortable, when you wears the heated vest, it's like a warm cozy hug around you. It's a great birthday/Halloween/Christmas/New Year surprise gifts for your parents, loved ones, and friends!