Personalized Class of 2021 Rocks Light Youth T-Shirt. Class of 2021 rocks text with three happy dancing rocks holding class of 2021 flags is a humorous gift design for school students excited about graduating in 2021. 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.