Personalized Under Arm Hair Black T-Shirt. Under arm hair, we've all got it. You can finally wear a shirt to tell the world you're a part of club and you don't need to work out to be in it! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.