XS/30 S/32-34 M/36-38 L/40-42 XL/44-46 2XL/48-50 3XL/52-54 4XL/56 5XL/58   Motorcycle Jacket Size Chart: Please measure the circumference of your chest in inches using a cloth tape measure and add one or two inches to the measurement to get to the next even number and choose that size from the size chart. Example: If your chest size is 44, add 2 to get 46. Choose XL size. If the measurement was 46 add 2 to get 48 which is a 2XL.