Keep Your Body Warm: 10 carbon fiber heating elements generate heat in the central areas of the body (back and stomach). Adjust 3 heat settings (high, medium, low) with the push of a button. 2 seconds rapid warm-up without waiting, intelligent heating.Material: Material Ingredient: 100% Polyester, Lining Material: 100% Polyester. Heat sheet: Carbon fiber. Lightweight insulation so you can wear it any way with unrestricted movement, providing the best heating. conservation and security.USB Port Power: This is to use the USB port, the USB plug is compatible with most of the power bank in the market. (Battery not included). Lining Material: 100% Polyester. Heat Sheet Material: Carbon fiberSize chartM, Bust: 98cm , Shoulder: 35cm, Length: 59cm L, Bust: 102cm , Shoulder: 36cm, Length: 61cm XL, Bust: 106cm , Shoulder: 37cm, Length: 63cm 2XL, Bust: 110cm , Shoulder: 38cm, Length: 65cm 3XL, Bust: 114cm , Shoulder: 39cm, Length: 67cm 4XL, Bust: 118cm, Shoulder: 40cm, Length: 69cm5XL, Bust: 122cm, Shoulder: 41cm, Length: 71cm6XL, Bust: 126cm, Shoulder: 42cm, Length: 72cm7XL, Bust: 130cm, Shoulder: 42cm, Length: 73cmRemarks :1. Please allow slight 1-3cm difference due to manual measurement.2. Please note that slight color difference should be acceptable due to the light and screen.Package included:1 x Men's Vest (Battery not included)Note: Asian size is 3 sizes smaller than European size, so please check the size chart and choose suitable size for you bofore you buy it, thank you