Personalized I Love My Grumpy Bright Rainbow T-Shirt. Show your love for your grandchild with our "I Love My Grumpy Bright Rainbow" design. It's not just a shirt, it's a statement of the special bond between grandparents and grandchildren. Order one for yourself or as a gift and let the world know how much you adore your grandkids. Get yours today and spread the joy and laughter within your family! 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.