Personalized Down Syndrome Custom T-Shirt. Make a personalized Down Syndrome awareness gift with our signature blue and yellow butterfly logo that you can pair with your custom name or quote on a T-Shirt - Red. 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.