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I'm 6'3" or so, and about 200 lbs, and this fit me very snugly. Not too snug, but it definitely hugged my torso and arms just like a thin wetsuit would do.
Getting it on and off takes a second -- it's a bit tough to do alone when it's wet and you are trying to roll it off your torso, but can be done with a small bit of effort.
Brushed up against some rocks while diving, which tore a small hole into it on the first day using it (of course). Have washed it a few times since then, and the hole seems to stay the same size, so that's a plus.
If I had to buy again, I'd probably get a size up for using it on land, although the way it is is fine for diving/snorkeling, otherwise you'll have to deal with drag.
The rash guard is perfect. I use it for kayaking and it is thin enough for breathability, but blocks all the sun so no sunscreen is needed on the upper body. Even after a year of occasional use, the stitching is all in great condition still.
Great shirt however I order a medium as that’s usually my husbands size and it was way too fitted but it fit my son perfectly and he’s usually a small. Advice order 1 size bigger. Over all great purchase. Height and weight given is based on my son since that who got to use it.