I purchased an XL for my husband, who usually wears an XXL standard t-shirt. This is very slightly trimmer through the hips than an XXL so it won't balloon up in the pool, but definitely XXL in length and shoulder/chest width. He looked at the XL tag dubiously, pulled it on to check the fit, and said, "Didn't think it would, but this fits perfectly." Wifely shopping prowess scores again! Nice drape and matte finish to the lightweight fabric, which is a definite plus here. The shiny, clingy spandex of many other rash guards is not so great for non-athletic bodies. I'd definitely recommend this for recreational swimming/boating/hiking - anywhere you want to avoid both sunburn and sunscreen. Though the price here on Amazon is lower than sporting goods stores, I docked one star for the steep-ish price.