This keeps the rain from puddling quite a bit more than with just the insulated cover over the spa.

It floats just like it said it would. I would say that is expected though. Now finding somewhere to put it when I use the hot tub, now that is a challenge, but I'm sure I'll come up with something.

Not as good as the last one I had from Wave as doesn't seem to cover the whole hot tub & leaves gaps. Seems to lose air more frequently than the last one.

I purchased this for two reasons. One, to keep the shape of the outer cover suitably supported and two, to see how thermally efficient this cover is. I can happily say that this cover works great on both fronts. Temperature hardly falls at all if tub has to be switched off overnight. All in all, an excellent purchase.

Helps keep heat in and prevents lid sinking in rain brilliant.