Personalized Chemistry Heart Dark Products Toddler T-Shirt. Chemistry text with a heart dotting the i in chemistry is a fun gift design for teachers, students and chemists at back to school, 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.