The memory foam beds are dense. The covers are nice looking and I like the way they zip on and off. The zipper runs across center of the bottom lengthwise. This make the cover much easier to remove and put back on compared to the old dog beds I had where they were like pillowcases. Durability remains to be seen. We took the advice of a previous reviewer and bought some baby crib fitted sheets to fit over the beds. Washing the sheets is a lot easier than the covers and should allow them to hold up much longer.