Note: The product does not include power banks. You need to use 5V.2A power bank. We are Asian size, 2-3 sizes smaller than European size. Please choose the correct size according to our size Chart and height and weight recommendations. Features: *1. It has 13 heating zones: back, neck, shoulders, waist, both sides of the abdomen. When the power is turned on, the whole body can feel the warm. Great for your winter going out, fishing, hiking, skiing, and more. *2. 3 heat levels are available, which can meet the needs of different environments. *3. General USB interface power supply, longer service life, splash-proof and washable. *4. Hand and machine wash. Do not wring. Disconnect and remove the power supply before wash and dry the vest before heating. *5. Thick lining provides strong breathable and warm performance, warm and comfortable to wear. Size S for Bust：102cm(40.16inch), width：39.1cm(15.39inch),length： 63cm(24.8inch).collar：7.5cm(2.95inch) Size M for Bust： 106cm(41.73inch), width：40.3cm(15.87inch),length： 65cm(25.59inch).collar：7.5cm(2.95inch) Size L for Bust： 110cm(43.31inch), width：41.5cm(16.34inch),length： 67cm(26.38inch).collar：7.5cm(2.95inch) Size XL for Bust： 114cm(44.88inch), width：42.7cm(16.81inch),length： 69cm(27.16inch).collar：7.5cm(2.95inch) Size XXL for Bust： 118cm(46.46inch), width：43.9cm(17.28inch),length： 71cm(27.95inch).collar：7.5cm(2.95inch) Size XXXL for Bust： 122cm(48.03inch), width：45.1cm(17.75inch),length： 73cm(28.74inch).collar：7.5cm(2.95inch) Size 4XL for Bust： 126cm(49.61inch), width：46.3cm(18.23inch),length： 75cm(29.53inch).collar：7.5cm(2.95inch) Size 5XL for Bust： 130cm(51.18inch), width：47.5cm(18.7inch),length： 77cm(30.31inch).collar：7.5cm(2.95inch) Size 6XL for Bust： 134cm(52.75inch), width：48.7cm(19.17inch),length： 79cm(31.1inch).collar：7.5cm(2.95inch)