Pressure-relieving pillow core can relieve cervical pressure and relax neck muscles Ergonomic design, all-round support for cervical health The inner core is filled with food-grade PE hose to flexibly support the head and neck Adapt to different sleeping positions, fit the neck when sleeping on your back, and no pressure when sleeping on your side Inner core material: memory foam Filling material: PE hose Outer pillowcase: Front [85% polyester fiber, 15% spandex] Side [100% polyester fiber] Bottom [87% polyester fiber, 13% spandex] Inner pillowcase: 92% polyester fiber, 8% spandex