Model:B589FG00682HJ2473 SIZE CHART: S: suitable for neck circumference 28-33cm; M: suitable for neck circumference 34-39cm; L: suitable for neck circumference 40-46cm; Material: PVC liner, PU leather; Width before inflation: 12cm Width after inflation: 18.5cm Product weight: about 400-500g Packing list: cervical traction device x 1, inflatable cylinder x 1 [Cervical Fixation] An ergonomic shape developed by a professional. The Neck Brace adjust the physiological curvature of the cervical spine, the Cervical Neck Collar Suitable for people with cervical discomfort. [Inflation & Stability]During inflation, the neck ring pushes the occiput up and the shoulders down, so that the cervical spine is gradually and gently decompressed. With a detachable air pump for stable inflation and deflation. [Easy to Use] It is recommended to use it for 15 minutes each time and use it twice a day. The neck can be fully rested and relaxed. It can be worn at home or in the office without affecting daily life. Reminder: This product can not replace the medicine, as well as the correct diagnosis and treatment of the doctor.