I currently have both the small and medium sized Leatt DBX Comp ii braces in my possession. Ordered the med but it felt too big on the smallest setting and ordered the small but i have no clue. I am around 6' 2" and 155lbs (skinny-ish). The small fits somewhat snug on the chest and back, but is also touching the collarbone. The medium leaves quite a large gap between the top of the thoractic strut and my back. But, it does steer clear of most of my collarbone and does not fit snug. I will post pics of both on if need be...