I was dubious that it would keep my plaster cast dry, but have used it a few times and it seems to have done so. It is easy enough to get on, but is very large to wear and a bit cumbersome, but as it is one size, that's understandable. It is a bit more tricky to get off, whilst keeping the plaster dry, but have discovered if you towel it down, before removing it, it helps to reduce any potential wetting of the laster