Personalized Seahorse Ocean Sea Creature Youth T-Shirt. Seahorse Youth T-Shirt - White has pair of seahorses in colorful colors for the sea creature lover, cute for National Oceans Month. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.