Hi fairy8i8,
I would make sure you find out the density of the topper before you purchase it to make sure that it meets the foam quality/density guidelines here and so you can make more meaningful comparisons with other highly resilient polyfoam toppers that are available that may be in a similar price range but have a higher density and are more durable. Polyfoam can be made using a foam formulation that makes the polyfoam more highly resilient than conventional polyfoam but they can still be a lower density and less durable material than I would consider.
Phoenix