I have three shirts that are the C9 brand and have had them for over a year. Just as durable as higher end shirts and very comfortable. I wear them almost year round. On cold days, I've found them to insulate very well and on hot summer Texas days, I've found them to wick very fast so I don't look like a big ol' sweatball.
I'll be buying them for my son for Scout campouts this spring too.
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Never moon a werewolf