Material Composition:71% Cotton, 25% Polyester, 4% ElastaneCare Instructions:Machine wash up to 40 degrees, gentle cycle, Do not Dry CleanDescription:Smooth AIRism fabric with the look of cotton. Great for wearing on its own or as an inner layer.- With stretch, DRY, Cool Touch, and odor control comfort features. – Perfect for layering. – AIRism was jointly developed by UNIQLO and Toray.