--3. The curved design of the chin rest is designed according to ergonomics, which is more fit and comfortable.   --5. The angle of cervical spine flexion and extension of this product can be adjusted. How to wear: 1.Under the guidance of doctor, gently move the patient, let him lie on his side, then remove the brace, place the back brace on the back as shown in the figure above, and adjust the position to fit the head.   2.Hold the brace, turn to supine, place the chest brace on the chest of the body, and adjust the position so that the chin is in the chin rest   3.Fix the chin rest strap, waist strap, head strap and shoulder strap in order.   4.Check whether the neck flexion angle is appropriate and whether the straps are too loose or too tight.   1. Cervical spine and high thoracic spine injury. 2. After Phosphorus fusion. 3. Neck push arthritis. 4. Stable fracture of neck frame 5. Service neck push flexion, extension and rotation   Product Function: Fix, limit and support the head, neck and chest