The cover is gray. Co-developed with sleep experts: The Newentor MP05 memory foam pillow is a 3D-cut pillow for back sleepers, co-developed with sleep experts. Experts recommend using a wide, rectangular pillow suitable for the neck when sleeping on your stomach, and that the pillow should be about three times the width of the head, or at least 60cm or more. Therefore, the MP05 pillow is designed to be 61cm long, making it ideal for back sleepers. Furthermore, the hollow design of the pillow has a slightly lower center and a wave-shaped form with a raised neck area. This design effectively supports the neck during sleep and can effectively relieve discomfort in the shoulders, neck, and head. No more worries about choosing the right height: "Newly released 3-layer structure with 4-level height adjustment" uses the latest memory foam and high-resilience urethane, allowing for 4-level height adjustment to suit various needs. You can freely switch between 9CM/11CM/12CM/14CM to match your optimal height. The perfect combination of low-resilience and high-resilience materials: Uses NASA memory foam developed exclusively for astronauts. This memory foam has excellent shock absorption, disperses pressure on the head, fits snugly to the neck, and promotes deep sleep. High-resilience polyurethane properly supports the neck during sleep, relieving neck pain and stiff shoulders. Obtained international safety and quality certifications: The included pillow cover is soft to the touch, washable, and has antibacterial and deodorizing effects for a restful sleep, and has obtained OEKO-TEX and CertiPUR-US certifications for safety and quality (Certification number: 0037478*). Note: The pillow itself cannot be washed, so it is recommended to dry it in a cool place.