This is the pillow that contains multiple chambers, enabling proper support and comfort whether sleeping on your back or side. Its unique design promotes optimal spine alignment and helps ensure comfort and correct posture for those who shift positions over the course of the night. The head rests in the center while the roll underneath provides a solid foundation for the neck, enabling the spine to align correctly and releasing muscle tension. Side sleepers will appreciate the generous side lobes bracketing the head for additional stability. The reverse side of the pillow contains a memory foam surface. With a 100% cotton cover that is machine washable. 25" L x 17" W x 4 1/4" D. (2 lbs.)