Believe me, if you swim in Open water the Orca Safety buoy is worthy of your consideration.
If you swim outside of a pool, for example in the sea or lake you may have experienced the
Almost run over syndrome
This is where a boat, maybe a motorboat almost runs you over.
The issue is usually visability and this is where the Swim buoy comes in.
But there is more! There is a storage compartment that you can put clothes or food or even your phone and electronics into. Then you carefully wrap the end up to form a waterproof seal. So everything will stay dry and the separate air sack means the buoy cannot sink.
Finally an adjustable strap connects the buoy to your waist.
Really recommended for any serious swimmer.