Help stop children from drowning

Lately I have been teaching my step daughter how to swim and I can't help but think about how flawed floaties are as a swimming aid, they are good at keeping kids arms a float but I find that unless you are constantly holding onto your child their head will still go under water (which I think is just dangerous and I can't help but wonder how many children have drowned because parents have put too much trust in their child's floaties).
Anyway I just found this on the internet, it's called a 'RippSaver' and it looks like it would solve a lot of the flaws that floaties have.
https://www.indiegogo.com/projects/rippsaver-safe-fun-in-the-water-for-…
What do you guys think?