Personalized Senior Year Rocks Long Sleeve T-Shirt. Senior Year rocks text with three happy rocks holding 12th Grade flags is a funny gift design for parents, high school teachers and students. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL