Reebok Boy's Performance Boxer Briefs - 3 Pack 90% Polyester/ 10% Spandex Machine wash cold with like colors. Delicate cycle. 90% Polyester/ 10% Spandex,Small (6/7) Medium (8/10) Large (12/14) Extra Large (16/18) Boys Performance Boxer Briefs Machine wash cold with like colors. Delicate cycle