Our heated vest can warm your body gradually to promote blood circulation and relieve stiff muscles caused by cold winter The heated vest is lightweight which can make it easier for you to go through the whole winter without wearing bulky clothes It can be used in some outdoor activities such as hiking, camping, outdoor skiing, fishing, etc. Built-in carbon fiber heating elements generate heat through core body areas such as shoulder and back to make you warmer and warmer Three temperature gears adjustable: 25/35/45. The body heater vest has a convenient USB plug that fits for most power bank (power bank is not included) Heated vest is machine washable, easy to keep clean Specifications: Material: 95% cotton, 5% spandex Lining: Composite fleece Three gears: warm 45, comfortable 35, energy saving 25 Operating temperature: about -5C to 40C Waterproof grade: IP3 Applicable scene: outdoor sports/daily Size Details: S: Length 56cm, Bust 90cm, Shoulder 34.1cm M: Length 58cm, Bust 94cm, Shoulder 35.3cm L: Length 60cm, Bust 98cm, Shoulder 36.5cm XL: Length 62cm, Bust 102cm, Shoulder 37.7cm 2XL: Length 64cm, Bust 106cm, Shoulder 38.9cm 3XL: Length 66cm, Bust 110cm, Shoulder 40.1cm 4XL: Length 68cm, Bust 114cm, Shoulder 41.3cm 5XL: Length 70cm, Bust 118cm, Shoulder 42.5cm Package included: 1 x Heated Vest Not include power bank