Personalized 100 Days Boy Monster T-Shirt. T-Shirt - White with funny cartoon green monster wearing glasses with book, pencils and blackboard says 100 DAYS SMARTER. Cute 100 Days of School gift for book worms, book nerds and book lovers. 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.