Serta 4-Pound Density Memory Foam Contour Pillow The contour shape is molded to cradle your head and neck whether you sleep on your back or side The premium zippered velour cover gives the final touch of luxury, that can also be removed for easy cleaning The Hypoallergenic formulation promotes a healthy night's sleep Memory foam responds the individual's body heat and weight to minimize pressure points and provide additional support Has four pounds per cubic foot (PCF) density; density is the measurement of performance and durability in memory foam and is expressed in pounds per cubic foot, not the actual weight of the product The contour shape is molded to cradle your head and neck whether you sleep on your back or side The premium zippered velour cover gives the final touch of luxury, that can also be removed for easy cleaning The Hypoallergenic and Anti-Microbial formulation promotes a healthy night's sleep Memory foam responds the individual's body heat and weight to minimize pressure points and provide additional support Has four pounds per cubic foot (PCF) density; density is the measurement of performance and durability in memory foam and is expressed in pounds per cubic foot, not the actual weight of the product