Don't think it's 100% cotton. The 6ft 3 guy's black henley hit just below the waistband and felt a little shiny (polyester?). My husband (230#) looked great and loved it, but the first time he wore it, he pulled it down a bit and it ripped horizontally near the edge. Strange! I doubt 100% cotton will do that. Works synthetically. I'm looking for the same shirt in a different quality.
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