Speedo 7050153 Youth Fastskin FSII Jammer Cycling Short 74% Polyester / 26% LYCRA Spandex FINA approved style - Fully compliant with FINA rules. Fastskin FSII, advanced and low drag racing swimwear. Inspired by the sleek, hydrodynamic properties of sharkskin. 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 accommodate the changing flow conditions along the swimmer's body.,Designed to repel water, compress the body, and devour the competition.,,