Personalized Best Step Mom Ever T-Shirt. Best Step Mom Ever! If your step mom is a superhero, then this is for her! Comic book style mother's day gift for any super step mom. 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.