Speedo launched the Fastskin II and staked its claim to the world's fastest suit after discovering that friction drag for swimmers is 6x more significant than previously thought. The suit surface mimics rough shark denticles to reduce drag along key areas of the body. The fabric compresses the body to stop skin vibration and muscle oscillation to save energy and further reduce drag. Fastskin II suits are non-exchangable, non-cancellable, and non-returnable except for manufacturers defects.