Premium Memory Foam: This pillow uses premium memory foam at its core which adjusts to the pressure that your head and neck place on it when asleep Washable Cover：The cover is made of soft velvet fabric,breathable and removable,and is fully invisible zippered ,it feels so soft and gentle when placing your head on it Support and Comfortable: The foam has been calibrated, It will keep your neck in a healthy position, alleviating pressure points and delivering proper support to meet your needs Slow Rebound: The lower the rebound force,the better the pressure absorbing effect,which can reduce the pressure on blood vessels when sleep,thereby improving the quality of sleeping Sleeping Helper: The pillows can help provide relief from several sleeping issues including snoring, insomnia, and migraines. These are great for neck and shoulder pain Widely Used: Great for all sleeping styles,such as side sleepers, back sleepers and even some stomach sleepers. The pliable memory foam will conform to the shape of your head and neck, which will keep the spinal column and back properly aligned Material: Low Rebound Memory Foam Cover Material: Premium Velvet Closure：Invisible zipper Color: Navy,Gray,Camel,Purple Size: 19.7" x 11.8" x 3.9"(W x L x H) Package include: 1/2Pack x Memory Foam Pillows