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 in the market( Low and safe voltage for body) has 3 temperature adjustable levels from 25℃ to 50℃. ( Please Note: battery is not include with the vest). 【Lightweight Comfortable Material:】 Made of high-quality cotton inner and waterproof&wind-resistant surface materials comfortable& warming better you can enjoy hiking skiing motorcycle fishing hunting camping or in the office working or as outdoor heated work coat. Easily keep yourself warm for a whole winter without wearing bulky clothes. 【Get Warmer Vest With No-risk:】 Support water/hand wash.the heating vest is perfect winter surprise for you, dad, mom, pals, spouse, or cherished ones for birthdays, Thanksgiving, or Christmas.