Personalized Life Better Triathlete Youth Long Sleeve T-Shirt. Triathlon athlete Youth Long Sleeve T-Shirt - White or the competitor in your life who enjoys biking, swimming and running says Life Is Always Better When I Tri. Perfect for that next competition. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)