Personalized Big Sister Superhero T-Shirt. Big Sister Superhero! The big sister looks out for her younger siblings, just like a true superhero should. Great T-Shirt - Cyber Pink for any super sis! 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.