SIZE CHART: M/165: back length 66.5cm, chest 110cm, hem 118cm, shoulder 44cm; L/170: back length 68.5cm, chest 114cm, hem 112cm, shoulder 45.5cm; XL/175: back length 70.5cm, chest 118cm, hem 116cm, shoulder 47cm; 2XL/185: back length 72.5cm, chest 122cm, hem 120cm, shoulder 48.5cm; 3XL/190: back length 74.5cm, chest 126cm, hem 124cm, shoulder 50cm; 4XL/195: back length 76.5cm, chest 130cm, hem 128cm, shoulder 51.5cm; USB Powered Electric Warming Vest: Compatible with any portable power bank on the market. Features low and safe voltage for body use with 3 temperature adjustable levels ranging from 25°C to 50°C. (Note: battery not included). Lightweight and Comfortable Material: Made with high-quality cotton inner layer and waterproof, wind-resistant outer material. Provides comfort and warmth, ideal for hiking, skiing, motorcycle riding, fishing, hunting, camping, or use in the office. Helps maintain warmth throughout winter without bulky layers. Washable Heating Vest: Supports hand or water wash. A great heated garment choice for winter activities or daily wear, suitable as a gift for family or loved ones on occasions such as birthdays, Thanksgiving, or Christmas.