In the bed industry, the memory foam mattress is often heralded as the pinnacle of sleep comfort. However, even though as a whole the genre is highly rated, some consumers do voice complaints with this type of bed. Make sure this fits by entering your model number.; The Signature Sleep Memoir 6 inch mattress is made with a 1.5″ top layer of comfortable Memoir Foam, followed by 4.5 inches of high density foam; this allows for the mattress to mold to the body’s natural shape for a comfortable night’s sleep The 12" Premium Memory Foam Mattress from HoMedics by Sinomax is the highest in sleep comfort with a generous 4.5in of memory foam. This design allows for a more natural air flow while you sleep. .