Most triathletes don't change their main clothes during a race. Tri-suits are very popular and can be worn for all three events. They're typically made from lightweight, moisture-wicking fabrics and have a lightly padded bottom for comfort on the bike. Some triathletes choose to wear a swimsuit during the first event and then quickly put on biking and running shorts during the transition.Regardless of whether you wear a tri-suit or a sport-specific outfit, your swim cap, goggles, cycling shoes, running shoes, hat, and sunglasses will all be moving pieces during the event. And of course, if you wear a wetsuit for the swim, you'll want to strip that off before getting on the bike!