Personalized Under Arm Hair Grey T-Shirt. Under Arm Hair, we've all got it. You don't have to work out to be a part of this club! Yea baby! 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.