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Natural rubber material. Pillow breathable， no hot Zhizhong sense. While its support force and firmness that best meet ergonomic principles body， improve blood circulation， eliminate fatigue and neck pain， unnecessarily reducing the number of stand generated during sleep. Effectively maintain the physiological flexion of the cervical spine， the neck muscles to fully relax. In sleep to relieve the cervical muscles， ligaments fatigue effectively play the role of the damaged cervical spine protection and restoration.