Personalized Class of 2021 Rocks Light Toddler Long Sleeve 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. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.