Personalized Summer Is Full Of Fun Adventures Together Youth Long Sleeve T-Shirt. Summer is best spent having adventures with a friend! Summer is Full of Fun Adventures Together Youth Long Sleeve T-Shirt - White, featuring characters from "Jonathan James and the Whatif Monster" by Michelle Nelson-Schmidt. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)