I bought Split king mattress protector. This is the best purchase I made. I have been using this past 3 months, I don't feel any difference from cotton bedsheet and underlying protection sheet. No slipping or making any noise. I would highly recommend.
This is my second GhostProtector purchase. The pad fits the GhostBed perfectly and it is truly waterproof. I had a senior cat with some continence issues, and none of her accidents seeped through the pad onto the mattress.