Personalized Environmental Blue Oval Toddler T-Shirt. Environmental Engineer, the sky is the limit on a blue oval is a humorous environmental gift design for birthdays, holidays and graduation. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.