Why Do Swimmers Wear Two Caps?

The first one is used to cover their hair, as latex clings to the head better. The second silicone one doesn't crinkle as much as latex, so it smooths any lingering bumpiness on the head. Without the second cap, there is more drag in the water because the first one could wrinkle.

Why are swimmers caps banned at the Olympic?

Why is the swim cap banned? FINA banned the swim cap because it does not follow "the natural form of the head," the Soul Cap co-founders told the BBC.

Why do swimmers slap themselves before the start of a race?

Also part of an athlete's race routine, it's something that gets an athlete ready to go. Male swimmers sometimes slap themselves red, especially on their pectorals. Women will also do this or use a closed fist instead. This slapping increases blood flow in the muscles which is helpful to the “warmup” process.