Upgraded heating elements generating heat from the abdomen and back to make you feel warm in 360 degrees. One button for 3 heating settings, made of soft skin-friendly material which ensures smooth and comfortable feeling. Features: Activates various functions between skin and promotes metabolism. Vitality restoration: it provides deeper adjustment of physiological functions to avoids sub-health state and restore the vitality. Set the temperature you want to respond to a variety of environments. A button to heating, three stall temperature control, intelligent heating. General USB interface, longer service time. Comfortable and breathable, and it's a nice partner for your winter going out. The product can be soaked and washed as a whole, and the power interface is treated with insulation and waterproof. Specifictions: Size: M, L, XL, 2XL, 3XL, 4XL (optional) Color: black Main material: polyester Interface: USB Temperature shift: Warm: 45-55 Degrees (Red Light) Comfort: 35-45 Degrees (Blue Light) Energy saving: 30-35 Degrees (Green Light) Length: M: 665mm L: 685mm XL: 705mm 2XL: 725mm 3XL: 745mm 4XL: 765mm Shoulder: M: 440mm L: 455mm XL: 470mm 2XL: 485mm 3XL: 500mm 4XL: 515mm Bust: M: 1.08m L: 1.12m XL: 1.16m 2XL: 1.20m 3XL: 1.24m 4XL: 1.28m Chest: M: 1.10m L: 1.14m XL: 1.18m 2XL: 1.22m 3XL: 1.26m 4XL: 1.30m Recommend Height/weight: M: 1.65m/50-55KG L: 1.70m/60-65KG XL: 1.75m/70-75KG 2XL: 1.85m/80-85KG 3XL: 1.90m/90-95KG 4XL: 1.95m/100-105KG Package size: 300 * 200 * 100mm / 19.7 * 11.8 * 3.9in Package weight: M: 450g / 1.0lb L: 500g / 1.1lb XL: 565g / 1.2lb 2XL: 600g / 1.3lb 3XL: 650g / 1.4lb 4XL: 700g / 1.5lb Note: The product does not include powerbanks. You need to prepare powerbanks. How to Use: Press and hold the power button for three seconds then you can use it, please note that you need to use the powerbanks when you use it. Cloth Size: We are Asian size, 2-3 sizes smaller than European size. Please choose the correct size according to our size chart and height/weight recommend. EU Size S = Asian size XL EU Size M = Asian Size 2XL EU Size L = Asian Size 3XL EU Size XL = Asian Size 4XL EU Size XXL=Asian Size 5XL EU Size XXXL=Asian Size 6XL EU Size XXXXL=Asian Size 7XL Packing List: 1 * Heating Vest