Personalized 100 Days Of Cray Cray | 100 Days Of School T-Shirt. Our 100 Days Of Cray Cray design features colorful crayons and a playful font, making it a fun and eye-catching choice. 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.