Whenever a person is on the water, it just makes sense to have sunglasses that do not sink. That is why so many people are looking for polarized floating sunglasses to use on a consistent basis. Not only can they be used on water, but they can be used pretty much anywhere else as well.
A polarized lens is just going to be able to handle glare and intense sunlight a little bit better. Most people will agree that the difference is pretty substantial, and that is why it is worth the extra money overall.
The floating aspect of sunglasses is something that will be very beneficial for anyone who is near water. Losing a pair of sunglasses just because one little mistake happens is not going to be very fun by any means. Nobody wants to have to make another investment like that.