Swimming in the buff, the athletes of ancient Olympics believed clothes were a hindrance on performance. Modern technology, however, has changed that. Notably in swimming, the right suit can have an enormous impact. Introduced in February, Speedo's LZR swimsuit, 38 of the 42 world swimming records have been broken since then have fallen to swimmers wearing these suits. Some of those records have been claimed by less-than-notable racers, suggesting that the difference lies in the apparel, not the athlete.
The new suit is cut from a densely woven nylon-elastane material that compresses the wearer's body into a hydrodynamic shape but is extremely light. Moreover, there are no sewn seams. The first fully bonded bodysuit. The suit is ultrasonically welded, creating a smooth streamlined surface. Built with a core stabilizer, the suit holds the swimmer in a corset-like grip allowing to maintain the best body position in the water.
Sources:
Video - "How the Speedo LZR swim suit works"
http://blogs.howstuffworks.com/2008/04/21/how-the-fastest-swim-suit-works/
http://www.speedo80.com/lzr-racer/features/







