From the Dr. Seuss Clothing Collection. Dr. Seuss Horton Group Project Gray Boys Long Sleeve Shirt. This heather gray longsleeved t-shirt features Horton with the Monkeys accented in a soft black flock and reads in a white distressed print "Horton Hears A Who!" Made of 100% soft and cozy cotton, tagless for comfort. Due to the characteristics of the special printing technique that give each garment its beauty, there may be slight shading variations and imperfections.