Personalized Mountain Biking Id Bike That Toddler Long Sleeve T-Shirt. Mountain Biking themed design has bike rider with I'd bike that message for her. 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.