Features: Built in USB heating module and intelligent temp control technology ensuring comfortable temperature in cold environments. Efficient heating component design, achieving rapid heating and feeling warmth within minutes. N Synthetic fiber blend fabric, it combines lightness and warmth, making it easy to wear without any burden. Multiple safety protections mechanisms to prevent overheating and short circuits, ensuring safe use. Suitable for multifunctional scenarios, classical vest design, 12 heat generating areas, 3-color change and temp control, can be worn alone or used as an inner layer to enrich the styling. Specifications: Fabric: blended synthetic fiber Size: M, L, XL, 2XL, 3XL, 4XL, 5XL Color: black, blue, red Size:M Length:60cm(23.62inch) Shoulder:37cm(14.57inch) Bust:98cm(38.58inch) Size:L Length:62cm(24.41inch) Shoulder:38cm(14.96inch) Bust:102cm(40.16inch) Size:XL Length:64cm(25.20inch) Shoulder:39cm(15.35inch) Bust:106cm(41.73inch) Size:XXL Length:66cm(25.98inch) Shoulder:40cm(15.75inch) Bust:110cm(43.31inch) Size:XXXL Length:68cm(26.77inch) Shoulder:41cm(16.14inch) Bust:114cm(44.88inch) Size:4XL Length:70cm(27.56inch) Shoulder:42cm(16.54inch) Bust:118cm(46.46inch) Size:5XL Length:72cm(28.35inch) Shoulder:43cm(16.93inch) Bust:122cm(48.03inch) Package Includes: 1Pc USB Heated Vest note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.