SIZE CHART: M/165: back length 66.5cm, chest 110cm, hem 108cm, shoulder 44cm, suitable for weight 50-55kg; L/170: back length 68.5cm, chest 114cm, hem 112cm, shoulder 45.5cm, suitable for weight 60-65kg; XL/175: back length 70.5cm, chest 118cm, hem 116cm, shoulder 47cm, suitable for weight 70-75kg; 2XL/185: back length 72.5cm, chest 122cm, hem 120cm, shoulder 48.5cm, suitable for weight 80-85kg; 3XL/190: back length 74.5cm, chest 126cm, hem 124cm, shoulder 50cm, suitable for weight 90-95kg; 4XL/195: back length 76.5cm, chest 130cm, hem 128cm, shoulder 51.5cm, suitable for weight 100-105kg; USB Powered Electric Warming Vest: Compatible with any portable power bank on the market (low and safe voltage for body) with 3 temperature adjustable levels from 25C to 50C. (Please Note: battery is not included with the vest). Lightweight and Comfortable Material: Made of high-quality cotton inner layer and waterproof & wind-resistant outer material for added comfort and warmth. Ideal for hiking, skiing, motorcycle riding, fishing, hunting, camping, or wearing in the office. Helps keep you warm all winter without bulky layers. Heated Vest for Warmth and Comfort: Safe to hand wash or spot clean. This heating vest makes a great winter gift for men and women, including dad, mom, friends, spouse, or loved ones for birthdays, Thanksgiving, or Christmas.