**The lining is thick and insulating. For winter layering comfort, we recommend selecting one size larger than your usual fit.** Model Height Weight Wearing Size 1 5'9" / 175cm 143lbs / 65kg 36 2 5'10" / 178cm 154lbs / 70kg 38 3/Shown 5' 10"/ 178cm 159lbs/ 72.5kg 40 4 5' 10"/ 178cm 165lbs / 75kg 40 5 5'11" / 180cm 176lbs / 80kg 42 6 6' / 183cm 187lbs / 85kg 44 Please use this info as a general guide as measurements are approximate. Size Shoulder Chest 36 18.5" / 47cm 41.3" / 105cm 38 19.3" / 49cm 43.7" / 111cm 40 20.1" / 51cm 46.5" / 118cm 42 20.9" / 53cm 48.8" / 124cm 44 21.7" / 55cm 51.2" / 130cm Size Length Sleeve 36 24.6" / 62.5cm 23.2" / 59cm 38 25.2" / 64cm 23.6" / 60cm 40 26.2" / 66.5cm 24" / 61cm 42 26.8" / 68cm 24.4" / 62cm 44 27.8" / 70.5cm 25.2" / 64cm In order to best determine fit, it may be helpful to compare our garment’s measurements to a similar garment you already own. Lay your garment on a flat surface and take all measurements from the outside of the garment. Click here to check out our Garment Measuring Guide. ** If you are still confused, you can Contact Us to help you choose the size. **