According to ergonomic principles, this pillow helps to maintain the vertebral column’s normal curve, to relax the cervical spine, so that it can make one’s head comfortable. The pillow inner is cylindrical columnar, filled by a ball made of highly elastic EPE. This material has high elasticity, recovery and strong features, so the pillow is not easy to deform when it is long-term used.Based on different person’s need, the pillow can be regulate the height by changing the support cylinder to suit for different people’s need.