They're made by a company called Duluth Trading Co. and they're called the "Longtail T®", and they're designed to prevent the dreaded "plumber bottom" effect when you're bent over working on something. The benefit for me is that the extra length also means that the shirt goes quite a bit lower and covers up my concealed pistol better, and I'm not constantly worried about it riding up when I sit down or reach for something above my head. Furthermore, they're made of beefy cotton knit, and the construction and quality is top-notch.
I'm probably going to order a few more, simply because I'm so impressed with how comfortable they are and how well they work for casual concealed carry during these warmer months. I'm a tall guy (6'6") so having the extra length is important for me, since a "tall size" is more of a "normal" length on me.
Here's a link to the product: MojoTexas
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