Personalized Swimming Nut Text Youth Long Sleeve T-Shirt. Swimming Nut text with a funny acorn nut wearing goggles and flippers is a humorous swimming gift design for swimmers and divers during summer swim season and at back to school, birthdays and winter holidays. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)