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. These fabrics were positioned to accomodate the changing flow conditions along the swimmer's body. Recordbreaker back styling. Fabric:81% Nylon/19% Lycra® spandex. Import.