* Strengthens neck muscles and has (4) attachment points for flexion, extension and rotation.
* For sizing, use circumference of head.
* X-Small 18.5″ to 19.6″
* Small 19.6″ to 21.2″
* Medium 21.2″ to 22.4″
* Large 22.4″ to 24″
* X-Large 24″ to 25.1″
