Fastskin FSII, the most advanced and lowest drag racing swimwear in the world to date, is now available for multisport activities. Fastskin FSII is a hybrid of two highly specialized Speedo - exclusive fabrics, Fastskin and Flexskin, to accommodate different flow characteristics across the body and reduce drag through the water, up to 4% decrease compared to original. Fastskin fabric mimics the rough shark denticles to reduce drag in key areas and features a Turbulence Management System. Features the Neutralizer, a unique 3D titanium silicone scale applied to the inner forearm Flexskin panel which allows the swimmer to neutralize the effect of the suit (i.e. feel the water). 9 thread flatlock - Speedo's unique stitching technology provides greater stretch for better fit and movement. Thread feels softer against the skin.