Personalized Black History Month Know Your Roots T-Shirt. Know Your Roots T-Shirt - Black are a cool and simple way to celebrate and remember your roots this Black History Month this February! Everyone loves our Custom T-Shirts! 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.