Stretch is Comfort Girl's Racerback Sports Bras 95% Cotton 5% Spandex and Nylon / Spandex Sizes by age: X Small (4), Small (6), Medium (8), Large (10), X Large (12) Perfect for working out and being active 4-Way Stretch Fabric / Made In The U.S.A. Wash cold with like colors/ Lay flat to dry