Personalized Bicycle Rocks Text Toddler Long Sleeve T-Shirt. An image of a bike with the word rocks spelled out by happy rock critters is a funny gift design for bikers at birthdays and holidays. 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.