Hi orchidvoyage,
Parklane is one of the members here which means that I think very highly of them.
I would need to know the specifics of the pettigrove construction though (layer thickness and density of the polyfoam) to make any meaningful comments about a specific mattress. Do you know the specifics of it’s construction?
Post #89 here has more about mattress protectors and I would choose the one that is the type you want and that you consider has the best value.
Congratulations on your new mattress 
Phoenix