Personalized Hearts Rainbow 100 Days Of School T-Shirt. Created with love and attention to detail, our Hearts Rainbow 100 Days Of School design features colorful hearts in a rainbow pattern, symbolizing the joy and excitement of reaching such an important milestone. Crafted with care, this apparel showcases your child's achievements and adds a touch of happiness to their school days. 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.