I really like the memory foam crumbles rather than a super firm memory foam solid pillow. The double layers between the outside of the pillow and the foam makes for a much more sanitary pillow. I like how the outside layer has a zipper to open it, and is washable. The only drawback, is the pillows needed to sit out for a few days to get the odor of new foam out. Overall, I love these pillows for sleeping on or for pillow positioning in bed.