OutdoorMedicine wrote a review of Stohlquist EBB Personal Flotation Device on May 24, 2013
Familiarity: I've put it through the wringer
I'm 5'10" ~140lbs; Picked up an "Adult Men's S/M" which fits well. There are about 10 points of adjustment, so the fit can be easily modified to your liking. The two chest pockets are handy for a snack, multi-tool, keys, etc. One pocket has an elastic strap which I use to secure keys. Zipper pull seems a little flimsy, but could attach a metal ring in its place. I use it for ocean kayaking and have done several week long trips of all-day paddling without any issues. Overall, well built, non-constricting, and well fitting.