Disney Juniors Mickey and Minnie Mouse Sporty Stripes T-Shirt Disney juniors athletic tee featuring Mickey and Minnie Mouse sporty striped sleeves, fitted cut, solid color back 60% cotton 40% polyester Officially licensed. JUNIOR sizing, which runs smaller than regular women's sizes. Small: 16" flat across chest, 9" sleeves, 24" long. Medium: 17" flat across chest, 9.5" sleeves, 24.5" long. Large: 18" flat across chest, 9.5" sleeves, 25" long. X-Large: 19.5" flat across chest, 10" sleeves, 25.5" long.