For reference, I am 5'8", 175, 40" chest and wear a medium in just about everything. Ordered a medium and it was so small I couldn't even get it over my shoulders. They didn't have a large or x-large so I can't say what might have worked. Ordered a different brand that fit just fine. I still gave it 3 stars because it seemed very well made and of good quality.

Definitely eye catching on the beach!

Great for taking the chill out for pools that are set at colder temps.  Allows me to move unencumbered for either swimming or aquatic exercise.

After purchasing similar shirts for my children, I decided to buy this rash guard for myself.  I am not over weight but have I have a large chest and shoulders and even the 3XL is a very tight fit.  Overall, I happy with the quality but would recommend that you strongly consider ordering at least one size (if not two) above what you normally wear.

great product!
I knew it fit tight so ordered one size up and am very happy.

looks good