Personalized Seahorse Ocean Sea Creature Youth Long Sleeve T-Shirt. Seahorse Youth Long Sleeve T-Shirt - Heather has pair of seahorses in colorful colors for the sea creature lover, cute for National Oceans Month. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)