【60D High-Density Memory Foam Pillow】 This pillow uses high-density 60D memory foam, and the high-quality filling provides excellent elasticity and stability, offering ideal support. When you lie down, the memory foam slowly envelops your head, providing a perfect fit. Compared to traditional sponge pillows, memory foam urethane is less prone to deformation and has a longer lifespan. 【Concave Hollow Design】 The concave hollow design stabilizes the head without putting pressure on it, providing a sleep experience that prevents neck pain. It can prevent cervical spondylosis. When sleeping on your side, it naturally lifts your head, keeps your center of gravity straight, opens your airway, makes breathing smoother, and prevents snoring. The arched design fits the curve of the shoulders, creating a natural curve when you rest your head, making your neck and shoulders feel comfortable. 【Double Protection & Washable Pillowcase】 It comes with a two-layer pillowcase, which firmly protects the pillow itself. The inner cover is made of polyester, which repels dirt and prevents the deterioration of polyurethane. The outer cover is made of high-quality velvet, which has excellent elasticity and flexibility, and fits the pillow body perfectly. It is breathable, does not get stuffy, and keeps the sleeping environment clean. Note: The pillow itself cannot be washed or exposed to sunlight. 【Adjustable Height】 Considering the differences in body types of our customers, we have designed the height in two stages: 7cm on the low side and 11cm on the high side, to accommodate different physiques. Whether it's a high pillow or a low pillow, you can adjust it to your preferred height by changing the orientation. If you feel that the highest part of this large pillow (11CM) is not high enough, you can place a towel underneath to increase the height. 【Ergonomic Design】 Warmstar's high-resilience pillow adopts an arched design, filling the gap between the back and the pillow, maintaining the natural curve of the neck during sleep, gently supporting the neck, and relieving neck and shoulder stiffness. The pillow is divided into four areas, stabilizing the head, reducing the burden on the head, and allowing for a good night's sleep.