Personalized Little Sister Penguin T-Shirt. Stand out from the crowd and express your personality with this enchanting collection that celebrates the joy of being unique. Dive into a world of style and fun with every wear! 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.