The Nike Swift Strapless goggles is normally used by Olympics swimmers. The goggles was started to use from 1976 Olympics. The function of the goggle is used for swimmers to protect eyes when swimming with a high speed as well as see under water. With the Olympics, the goggles require high performance. The first factor should be comfortable. That is to say, the goggles have to keep the water outside but not that tight, otherwise, it would cause too much pressure on the swimmer's eyes. Though the Olympics is a world sports ceremony, the competition is still existed. Hence, the goggles have visual function so that the swimmer can focus on track.
For swimmers who attend Olympic , they need good visibility a goggle to help them perform good. I heard that the Nike Swift Strapless Goggles are used by Olympic swimmers as they offer good visibility and have the added bonus of not having a nose bridge. Besides, i heard that the Olympic gold medalist Michael Phelps in the 2008 Olympic games are worn Speedo swim goggles.
That's a very good question.Firstly, you gotta be aware that Olympic swimmers are often well funded and they can just pay to get goggles especially designed for them to use. However, there is no need to make different goggles . Normal goggles are good enough to serve them. Maybe the only difference lies in the materials.