Butterfly Cervical Pillow for Superior Sleep Adjustable Height: If you struggle to find the right pillow height, our cervical pillows offer two different heights on each side, allowing you to choose the perfect fit for your sleeping position. Arm grooves provide comfortable arm support while sleeping. Designed for All Sleep Positions: This pillow is suitable for all sleeping positions, including stomach, back, and side sleepers. Ergonomic Design: The butterfly pillow is carefully designed with six unique zones to support your body's natural curves. Combining the benefits of traditional pillows, the 15-degree inclined hollow surface intelligently supports your head while maintaining the natural curve of your neck and perfectly aligning your spine. Wake up feeling refreshed! Premium Memory Foam: The neck support pillow is made of high-quality, CertiPUR-US certified rebound memory foam. Premium quality, firm yet not too soft, for maximum comfort and relaxation of head, neck, shoulder, and back muscles when lying on your back or side. Removable & Washable Cover: The side pillow features a double-layered, high-quality pillowcase that is soft, stretchy, and conforms well to the pillow core. It's removable, zippered, and machine washable. The pillowcase is made of cotton and polyester and feels great against your skin.