Personalized Black History Month Know Your Roots Long Sleeve T-Shirt. Know Your Roots Long Sleeve T-Shirt - Black are a cool and simple way to celebrate and remember your roots this Black History Month this February! Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL