Our Long Sleeve Longtail T® Mock Turtleneck is beefed up in all the right places for working guys. Like all our Longtail T Shirts, it's longer in the body so your caboose stays covered when you bend or reach. Clever Armpit Gussets add freedom of movement and keep the cuffs reliably in place at your wrists. And for those who are a tad demanding about their neckline, we worked with our Trades Panel testers to get the collar height just right to ward off chills without the extra bulk. Other comments from our on-the-job testers include: "Easy to move in." "Felt great under a flannel shirt." "So comfortable you could sleep in it." "Don't change a thing." We don't intend to!