Wetsuits do more than keep you warm—they can actually make you a faster, more efficient swimmer. Backed by research, this article breaks down how different wetsuit styles impact speed, buoyancy, and energy use. You’ll also learn how to choose the right wetsuit thickness based on water temperature, what to wear underneath, and when wetsuits are legal in races. Whether you're training for a triathlon or open water swim, this guide will help you select the best gear for performance, comfort, and confidence in the water.