But all jokes aside, this "buoyancy device" does actually work. I was a little suspicious at first because it's makes very clear it is not a certified Canadian life jacket, and it is quite thin. So I had to test to make sure my butt would actually float down the river in the concerningly thin floatation vest.Sure enough, I jumped in the fast moving river and it carried my thicc thighs above water no problem at all.I with with the M/L and at around 135lbs it worked like a charm!The pockets are plenty, the zippers work perfectly, the whistle is a fun addition (and safe I guess too) and the adjustments made it fit great around my small upper torso. If you're stacked with an upper chest you would be fine too though, as the straps adjust many ways along your ribs and shoulders for a great fit. I usually wear a women's small in tops and this adjusted to fit just fine. If you're very petite at an Xs or smaller on top maybe consider the Teen size though, I was pretty cinched in.I would maybe consider a more sturdy pdf in an ocean or rapids for sure, but to paddle board in a lake or river it does the trick!Feels nice and light and looks great too.