As far as fit goes: I am a big guy, fits me well (6' 250lb). The belt strap might be a little short. With a jacket on I have about 3" left. The directions are pictorial. I like them. There are three holes in the back brace for med, Large, and XL. you can see them in the image just above and below the strap assembly, it is set on Large (the upper strap assembly can be moved to one of these three holes). In other words: The strap assembly moves up and down the back brace using these holes to adjus...