memory foam mattress: scientific research revelas that, mattress using memory foam can reduce human body's contactstress density with bed, thus reduce back pains and help people sleep well.
memory foam pillow: pillw with contour shape will help neck and body
memory foam topper: this is the layer on top of regular mattress.
memory foam pad: this may be same as topper, but also sometimes means cover
memory foam cover: this is the cover that covers the mattress