Please use this info as a general guide as measurements are approximate. Model - 5' 10", 160lbs / 178cm, 72.5kg. Size 40. Size Shoulder Chest 36 18.9" / 48 cm 41.3" / 105 cm 38 19.3" / 49 cm 43.3" / 110 cm 40 20.1" / 51 cm 44.9" / 114 cm 42 20.5" / 52 cm 47.2" / 120 cm 44 21.7" / 55 cm 49.6" / 126 cm Size Length Sleeve 36 23.6" / 60 cm 22.0" / 56 cm 38 23.8" / 60.5 cm 22.8" / 58 cm 40 24.2" / 61.5 cm 23.2" / 59 cm 42 25.2" / 64 cm 24.0" / 61 cm 44 27.2" / 69 cm 25.2" / 64 cm 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. **