Personalized Unicycle Irish Shamrock Toddler T-Shirt. A unicycle against an image of an Irish shamrock is a unique Irish gift design for bicyclists on birthdays and St. Patrick's Day. 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.