Specifications: Built-in heating module, smart heating and three gears temperature control. The power supply interface is insulated and waterproof, support washable. Sleeveless vest, let you feel warm no where you are. Portable battery power supply, itself has no battery. Type: Electric Heated Vest Material: Polyester Gender: Men Season: Winter Features: Electric Heating, Sleeveless, Washable, Warm Size Details [Our Size S] Length Below Shoulder: 63cm/24.80", Chest: 102cm/40.16", Shoulder: 39.1cm/15.39", Length Above Shoulder: 7.5cm/2.95" (Approx.) [Our Size M] Length Below Shoulder: 65cm/25.59", Chest: 106cm/41.73", Shoulder: 40.3cm/15.87", Length Above Shoulder: 7.5cm/2.95" (Approx.) [Our Size L] Length Below Shoulder: 67cm/26.38", Chest: 110cm/43.31", Shoulder: 41.5cm/16.34", Length Above Shoulder: 7.5cm/2.95" (Approx.) [Our Size XL] Length Below Shoulder: 69cm/27.17", Chest: 114cm/44.88", Shoulder: 42.7cm/16.81", Length Above Shoulder: 7.5cm/2.95" (Approx.) [Our Size XXL] Length Below Shoulder: 71cm/27.95", Chest: 118cm/46.46", Shoulder: 43.9cm/17.28", Length Above Shoulder: 7.5cm/2.95" (Approx.) [Our Size XXXL] Length Below Shoulder: 73cm/28.74", Chest: 122cm/48.03", Shoulder: 45.1cm/17.76", Length Above Shoulder: 7.5cm/2.95" (Approx.) [Our Size XXXXL] Length Below Shoulder: 75cm/29.53", Chest: 126cm/49.61", Shoulder: 46.3cm/18.23", Length Above Shoulder: 7.5cm/2.95" (Approx.) Notes: Due to the light and screen setting difference, the color of item may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Electric Heated Vest