This is the ergonomically designed cooling pillow that improves sleep conditions for those suffering sleep apnea. It consists of three layers of ventilated, perforated foam that encourages more restful slumber: memory foam that molds to your facial contours, high resiliency foam for support, and charcoal-infused foam that neutralizes odors. Its concave center improves airway alignment to ease breathing, while crescent side cutouts and an 18" L hose tether reduce mask leaks and allow freedom of movement throughout the night. The pillow switches from a mesh side that reduces heat and perspiration to a soft pillowtop with hypoallergenic fiberfill. Removable layers allow adjustment to four different heights (2 1/4", 3", 4 1/4", 5 1/4"). Works with all brands of CPAP masks. 5 1/4" H x 20" W x 12" D. (3 1/4 lbs.)