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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.