Years ago, I bought a cover from this company and immediately stopped itching every night when I went to bed. We recently bought a new bed.  The mattress was a little thicker so we needed a new mattress protector. 
My big problem is dust mites. So I bought a new cover to protect our new mattress and also covers for the boxsprings. I spent years just itching when I went to bed and not understanding why. It’s such a pleasure to go to sleep.