Three Layers Neck Traction Collar Relief Cervical Traction Device Features: The size uninflated: approx.27x 28cm--10.5x10.9"(LxH) Inflatable tube length: 34cm/13.3" Material: PVC and flannelette Size: one size fit most Light weight and easy to use. Comfortable and non-threatening. Adjustable universal size for most man and woman. Application: People who spend long time on the computers, cars. Suitable for: Reducing neck, shoulder and back pain while working, studying, driving, etc. This comfortable and easy to use neck cervical traction device elongates neck muscles, often resulting in rapid and prolonged relief from the soreness and irritation that accompanies cervical problems. Caution: Do not: Sleep with it on, Use as a neck brace, Use with recent acute, or sprain/strain injuries. Do: Use only as prescribed by your doctor if applying to serious injury. Note: Follow your doctor's directions if prescribed, and relax as much as possible during use. If discomfort occurs during use, expel air slowly, adjust angle and pressure until discomfort disappears, then try again. When doing medium or major traction, you may prefer to close the low-pressure air chamber before pumping is finished so that the upper air chamber remains comfortably soft. Major traction should follow 30-60 minutes of minor or medium traction. Repositioning of traction must follow doctor's directions.