I hate to break it to you, but this
is for the Redditors who don’t care for the safety gear they wear for swimming.
It’s for the people who don`t like the idea of wearing a safety vest in the pool.
It is designed to protect you from the water’s abrasive properties, so that you can breathe more easily and safely.
And yes, it’s waterproof, too.
That’s all there is to it.
[The Reddit article, as seen here]