Not so long ago, athletes competed in cotton vests and baggy shorts.
But in today's competitive climate, where winning margins are often measured in hundredths of a second, athletes look to hi-tech sports fabrics for sporting advantage.
Sports clothes are now marketed to the public at large, and science has become a major selling point.
Jonathan discusses some of the new textiles with scientists and manufacturers.
Breathable fabrics might allow sweat to escape and at the same time keep the rain out, but will they help us perform any better?