I just received this shirt today so I don't know how it will perform on a sweat test but the sizing is a bit off. Everything I wear is XL so I ordered it in XL. It's a little small, not much, but just a little. I don't like tight shirts but this one is a bit tight. It's really not enough for me to give it back, so I keep it to myself and hope to keep losing weight. After wearing and washing according to the instructions several times, the reflective strip on the left sleeve fell off. I still love the shirt and it didn't shrink after washing/drying so that's good. I only bought this shirt for running as most of my shirts were dark and I needed a lighter shirt after moving to South Carolina because of the sun. It works for that, and it was cheap there. we will wear it
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