clip-ons lock your feet to the device. If you find yourself needing to suddenly swim away from the device for any reason, you better hope that you can easily clip out. On a bicycle, you can do this fairly easily because you're on ground with gravity. In water, it could be much more challenging to clip out.

> If you find yourself needing to suddenly swim away from the device for any reason

Can you elaborate on that part?

You would set the cleat retention tension lower than for a bicycle. (But also this product is ridiculous, no one is actually using it.)