So this may not necessarily be the topper's fault, but I bought it for our sleeper sofa queen mattress, and it hangs off of it significantly on the ends (like 6"-9" on both ends), so either my sleeper is short or this guy is long. I also thought it would compress enough to stay on the sleeper even when folded, and you can't get it closed. Again, the intention of this topper isn't necessarily for a sleeper sofa, but just in case anyone else out there was trying to make their sleeper more comfortable, I probably wouldn't buy this topper for that kind of mattress. ;-P