I ordered 3 beds.  Each bed is a different depth... suppose to be 4 inches... only 1 was 4 inches, others were 2.5 and 2.0 and the density of the foam is terrible.  Our dog is disabled and the ortho beds are a critical part of her care.  Very disappointed in the quality .   These are the worst Serta I have ever come across … buy them live vs ordering!  Giving a 2 as the cover is fine.