Reebok Men's 3 Pack Stretch Trunk Solid: 95% Cotton, 5% Spandex; Heather Grey: 84% Cotton, 11% Polyester, 5% Spandex Imported Machine Wash Stretch fabric with no ride up Reebok logo waistband Tag free for comfort Machine wash Solid- 95 percent cotton, 5 percent spandex. Heather grey- 84 percent cotton, 11 percent polyester, 5 percent spandex