The only reason I bought this sheet was because I thought it would cover all six sides, so there's absolutely no chance of it slipping off. This is not that, instead it's simply an elastic fitted sheet with removable tops. There is absolutely nowhere in the description that mentions this, and all of the product images carefully avoid showing the bottom. It frankly borders on false advertisement.
Still, I can imagine people getting some use out of this, as long as they're aware of what the product actually is.