clever design that offers wonderful support and bounce filled with 100% memory foam hypoallergenic with a machine-washable outer casing available in firm support and great for side sleepers made from the most premium memory foam, our cleverly supportive, hypoallergenic pillow ensures excellent recovery, bounce and longevity to offer perfect comfort to those that require a firm-support pillow. if you sleep on your side, this pillow will bridge the gap between your shoulder and neck for perfect alignment.