Personalized 2021 Best Shot Toddler Long Sleeve T-Shirt. Class of 2021, Taking Our Best Shot! A gloved hand with a syringe fills the zero. 2021 seniors have a lot to deal with, but they will give it their best shot. Vaccinated. 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.