Personalized Ninja Master Youth Long Sleeve T-Shirt. Youth Long Sleeve T-Shirt - White with cute Ninja face with red head scarf says MASTER NINJA. Perfect for little warriors. Matching NINJA IN TRAINING design also available. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)