Combination independent pocket springs and an outer layer of viscoelastic /Memory foam. Effective for “learning and remembering” the exact shape of your head and neck, adjusting continuously to any position during sleep. It relieves pressure on sensitive areas of the head and neck, so the muscles are relaxed and blood flow is more free. It optimizes the head/neck alignment with the spine, increasing comfort and overall feeling of well-being. The internal spring core contains a significant amount of air, which, through the viscoelastic holes, releases excess heat and humidity. This pillow is hypoallergenic, always stays in shape and does not lose its density.