The Sleep Philosophy contour knee pillow was created with side sleepers in mind, it creates the proper posture while side sleeping by elevating the upper knee and allows for a more comfortable night's sleep. Pillow is constructed out of study urethane foam with a 1'' gel infused memory foam outer layer on the sides which helps keep you cooler while molding the pillow to your exact shape. Includes a machine washable, breathable knit cover. Measures: 11'' x 8.5'' x 7''