Memory P.f. is a high quality memory foam that is designed to give the end user the "personal fit" of memory foam. Memory P.f. is the highest quality, low priced memory foam on the market and features a 6lb. density, the same as the market leader. Each piece contains pure visco elastic foam that is encased in a washable luxurious blue zippered velveteen cover. The N3003 Health Neck Pillow is the ideal cushion for back sleepers since it countoured neck support.