Smart Charging Heating Vest Heating Vest Product Information： Pattern: plain Suitable season: winter, spring, autumn Applicable age: adult Applicable gender: neutral/male and female Fabric name: chemical fiber blended Fabric composition: polyester fiber (polyester) Fabric composition content: 100 (%) Lining name: Cotton Lining composition: polyester fiber (polyester) Lining ingredient content: 100 (%) Style: sports and leisure Function: 8 fever vests, 9 fever vests, 11 fever vests Filling: cotton Collar type: stand-up collar Color: blue, black Power supply: USB power bank heating Size Information: Size: S, M, L, XL, XXL, XXXL, 4XL,5XL,6XL 1.Asian sizes are 1 to 2 sizes smaller than European and American people. Choose the larger size if your size between two sizes. Please allow 2-3cm differences due to manual measurement. 2. Please check the size chart carefully before you buy the item, if you don't know how to choose size, please contact our customer service. 3.As you know, the different computers display colors differently, the color of the actual item may vary slightly from the following images. Packing List： 1 Heating Vest 9100001116480-CJTW1349392-3256805804877239