How to choose a silicone swimming cap?

Now ordinary rubber swimming caps are marked as "silicone".

The advantage of the rubber swimming cap is that it fits the head better and has less water resistance. Therefore, the general competition swimming cap is a rubber swimming cap. The disadvantage is that the head is squeezed. If it is not worn well (the head wears a small cap), it is easy to slip off. If it is slightly damaged, it is completely discarded. Spandex swimming caps are ordinary chemical fiber textile swimming caps. The advantage is that it is light and comfortable, and it is suitable for leisure playing in the water. The disadvantage is that it is easy to permeate, so the water resistance is large.

Now there are PU swimming caps, which are a kind of cloth swimming caps, which combine some of the advantages of cloth swimming caps and rubber swimming caps. However, it is recommended to use suitable rubber swimming caps for real swimming exercises.