Personalized My 1st 10K Run Girls Running Fitness Long Sleeve T-Shirt. Cute my 1st 10K run Long Sleeve T-Shirt - Pink fitness running outfit for girls. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL