Model Height Weight  Size 1 5' 7" / 170cm 143lbs / 65kg S 2 5' 10" / 178cm 160lbs / 72.5kg M/Standard fit 3/Shown 5'10"/ 178cm 136lbs/ 62kg M/Realxed fit 4 5' 11"/ 180cm 176lbs / 80kg L 5 5' 10" / 178cm 194lbs / 88kg XL 6 6' / 182cm 221lbs / 100kg XXL   Please use this info as a general guide as measurements are approximate. Size Shoulder Chest S 17.3" / 44cm 38.6" / 98cm M 17.9" / 45.5cm 40.6" / 103cm L 18.5" / 47cm 42.5" / 108cm XL 19.3" / 49cm 44.5" / 113cm XXL 20.1" / 51cm 46.5" / 118cm Size Sleeve Length S 7.5" / 19cm 25.6" / 65cm M 7.9" / 20cm 26.4" / 67cm L 8.3" / 21cm 27.2" / 69cm XL 8.7" / 22cm 28" / 71cm XXL 9.3" / 23.5cm 28.5" / 72.5cm 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. **