I bought a new memory foam mattress & added this for extra protection.  With the investment I made in the mattress I felt this was a natural choice.  I have dust mite allergies & will be able to keep my new mattress clean & fresh.  In the past I bought a memory foam mattress with their expensive brand protector that caused excessive perspiration.  I had to put an additional quilted cover on top of it to prevent the over heating.  This cover solves that problem.