Speedsuit

A speedsuit or fastskin is a very tight-fitting garment, generally made of spandex, covering the torso and usually the arms and legs. It is designed to streamline the body to speed up competitors in swimming, cycling or skiing races.

Suits for competitive swimmers are so tight that they take a long time to put on, and may require two assistants to do up the zip. Those for males should be tight over the crotch.