Neck protections function: the unique design can effectively the cervical uncomfortable, help improve sleep Not collapsing design: Even after prolonged use, the pillow cores keep its shape and is not easy to deform, ensuring long time comfort From A Class memory foam component with excellent elastic and, it can effectively fit the neck and relieve pressure Breathable Pillowcase: Equipped with a highly-quality pillowcase, soft and breathable, it is not easy to feel stuffy when using it in spring Ensures durability with adapt responsiveness that adjusts to body temperature and weight