SPEEDO Male Fastskin II Hi-Neck Bodyskin Fastskin FSII is 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 of the body. White Flexskin fabric splices allow greater flexibility and less drag. The fabrics were positioned to accomodate the changing flow conditions along the swimmer's body. Features a Turbulent Management System with vortex controllers on chest and shoulder blades to reduce drag. Zipper in back designed for competing freestyle, breaststroke and butterfly events. Fabric:81% Nylon/19% Lycra spandex. Import.