DS broke his wrist this past fall and his pediatric orthopedist (who comes highly recommened) told me to get the xerosox, Melk, I think this is what you were describing, you are right it is great, very easy to use. It doesn't let in one drop of water and you don't have to deal with having a wet cast even if it is the type that you can go in the water with. It comes in several different sizes for full or half arm, even for legs. Also another cast tip, our orthopedist told us to dump 1 oz. of baby oil down the cast once a week, it really helps with the itching from dry skin. I worked in Physical Therapy for 12 years and never heard of this before, and from experience I could see that his skin was in good shape when the cast came off. It also smells a lot nicer.