Jaco Tenacity Resurgence Fight Shorts 10% spandex Ultra-durable STR-X fabric that stretches effortlessly in all directions and wicks perspiration rapidly. Patent-pending compression waist-tightening system that can be tightened without creating "scrunching or cinching" around the waist while providing a comfortable, no-slip fit. Internal stretch pocket located at the bottom of the shorts' leg opening so that you don't have to untie your shorts every time you want to stow your mouthguard. Fly backing panel construction to prevent rubbing and chafing from the fly's hook and loop material. 90% Polyester & 10% Spandex