Personalized Biology Sphere Toddler T-Shirt. Biology the is science of life. This colorful design makes a great gift for students, teachers, and medical professionals at birthdays, holidays, graduation and back to school. 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.