The Crooks & Castles Reverse Core Sweatpant Black is soft to the touch with adjustable drawstring. 80 Cotton, 20 polyester Cotton French Terry Pre-shrunk. The Serif joggers are true to size. The Crooks & Castles Reverse Core Sweatpant Black is soft to the touch with adjustable drawstring. 80 Cotton, 20 polyester Cotton French Terry Pre-shrunk. The Serif joggers are true to size.