I was surprised this wasn't cotton, which is my fault. It says, right there at the top of the page:-Quick-drying material, polyester and spandex,soft and comfortable to wear. Skin-friendly.And, it is. It's comfortable, and the primary purpose I had for it was the Memorial Day Murph. So it got soaked with sweat, although I'm not sure where the sweat went. It seemed to wick it away and poof, it was gone.I'd say if a shirt is sized right, which 80% aren't, I wear a medium. This in a large fit like a medium but was a little long for my preference, but it worked out fine. I'm about a 40-42 chest, 31 waist and down to about 145 right now. It's hard enough to get shirts to fit, but this did fine. The usual issue was the same here, the next being slightly large. That said, I'd have to have a shirt custom made to fit me just right.
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