The American Tall Essential Slim Fit Long Sleeve Tee in Black. Fitted through the torso and sleeves, our SLIM-FIT is perfect for both slim and athletic builds. Excellent on its own, perfect for layering. These 95% cotton, 5% spandex premium tees offer unmatched comfort and stretch, working well on their own, or as a base layer under a tall button-up shirt. Simply size up if you’re wanting a looser fit. Essential is an understatement.