I would NOT describe these pillows as true "memory foam" as they are on the firm side. But they have good resiliency and do not get "squooshed" like softer flimsy pillows. If you sleep on your side you will LOVE these pillows. Even though they have the contoured edges to allow the pillow to rest at a slight angle, I find them a little too stiff. to comfortably sleep on my back.