It's a nice mattress pad but I'm disappointed that it is not one that surrounds the corners of the mattress; however as I look at the photo - corner elastic is what is shown, my mistake. It seems a nice cover in any event and I expect that it will protect the mattress and add a bit of cushion. I bought it to put over a memory foam cushion though and rounded corners would have held that in place better.

Pros: Fits the top of a sofa sleeper mattress.
Cons: Corners not optimal for staying in place.