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I normally wear a XXL in most shirts overall. I ordered a XXL in this hoodie. What arrived was a wadded up piece of material in a plastic bag. Once I opened it, I immediately could recognize this was not going to fit. Even then, I attempted to try the shirt on. Basically, this fit like a compression second skin type of shirt. Even the hoodie part was tight around the head as well. The sleeves were so tight that I couldn't slide them up past my forearms. The material overall is lightweight, but there were almost no seams and just extremely plain, even for a solid color shirt. I immediately logged onto Amazon and set up the return process. If you were using this as a compression (but not actually) undershirt during the winter, I suppose you would be fine. Just wearing it as a shirt wasn't an option though.
Shirt does not breath very well. Also the sleeves are really tight, I wish they were loose fitting in case I wanted to roll them up for a little bit. I sweat wearing it an air conditioned house. Can't say how the UPF 50 works because the shirt is too warm to wear when it is hot out.
This shirt is comfortable and works great for fishing, hiking, or jogging. Sizing does run one size smaller in the chest area, felt just a bit tight across my shoulders and chest. Occasionally thought it would rip if I reached for something or stretched my back. It is very light right and on hot days I'm able to stay cool wearing this.