Having a headache on finding the right pillow height? AirCozy Classic can automatically adjust to the perfect pillow height to accommodate to sleep position.   Features/Functions: -       Sleep position is being monitored in real-time. -       Full automatically adjusted the pillow height by sleep position. -       Protects your cervical spine and arms -       Healthy sleep solution  -       Improves deep sleep time -       Global patent   Material: -       Pillowcase: TENCEL -       Pillow: Novel memory foam (Softer and bouncier)   Specification: -       Pillow size: S、L