Fastskin® FSII, the most advanced and lowest drag racing swimwear in the world to date! Fastskin® fabric mimics the rough shark denticles to reduce drag in key areas and features a Turbulence Management System. Grey Flexskin fabric splices allow greater flexibility and less drag. Flexskin panel on inner forearm has a titanium silicon scale that neutralizes the drag. See FSII Info Center below for details of the Turbulence Management System. Fabric: 81% Nylon/19% Lycra® spandex. Import.