Model is 5'10" / 178cm and weighs 154lbs / 70kg. Wears a size M. Please use this info as a general guide as measurements are approximate. Size Shoulder Chest S 17.7" / 45cm 39.4" / 100cm M 18.3" / 46.5cm 41.3" / 105cm L 18.9" / 48cm 43.3" / 110cm XL 19.5" / 49.5cm 45.3" / 115cm XXL 20.1" / 51cm 47.2" / 120cm Size Length Sleeve S 26.2" / 66.5cm 7.1" / 18cm M 27" / 68.5cm 7.5" / 19cm L 27.8" / 70.5cm 7.9" / 20cm XL 28.5" / 72.5cm 8.3" / 21cm XXL 29.3" / 74.5cm 8.7" / 22cm 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. **