Personalized Stay Cool Toddler T-Shirt. Swim, stay cool in the pool in wavy text is a unique design for swimmers at back to school, birthdays and holidays. 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.