Bought this  double size topper for a caravan as the equivalent designed for caravans was over twice the price.Has made all the difference to sleep quality.No more pain in the hip bone when side sleeping and for this application folds easily for storage.
As with all memory foam it will feel damp and smell coming out the packaging but will disappear after a week.
Only downside is the cover is a tight fit and pulls up the corners.
That aside I highly recommend.