When the operational environment or date night calls for a collar, we wanted the same trusted Tri-BlendX fabric as our beloved GORUCK t-shirts, the ones we have dozens of on our shelves. Tri-BlendX is anti-stink, soft, and tough as nails - proven at thousands of GORUCK Events since 2010. The collar really classes it up. Sunday mornings come once a week and this is how I dress up. And when it&';s time to break a sweat, I&';m still good to go in a shirt I love to wear. -Jason