The Cervitrac Pillow promotes proper sleeping posture by supporting the neck in a natural position. Designed with multiple channels and a recessed center, this pillow provides the support level needed while limiting fiber migration. The unique design promotes an open airway, helps relieve spasms, alleviates neck tension, and helps maintain the natural cervical curve of your neck; ideal for tension headaches, neckstrains and sprains, ligament sprains, whiplash injuries, and neck arthritis.The Cervitrac Pillow?s recessed center provides maximum comfort. When sleeping on your back, the center cradles your head while the cervical lobe supports your neck in a naturalposition. When changing positions from back sleeping to side sleeping, the pillow's raised side channels provide proper support to gently hold your neck in a comfortable position. Place the small cervical channel against the neck for gentle support or place the larger cervical channel for maximum support. The fiber channels limit fiber migration and extend the life of the pillow.Most people experience an increase in sleeping comfort within a couple of days. Others may require up to two weeks before the neck and back muscles adjust to their proper position. Either way, restful sleep is on its way. The standard firmness provides comfortable support and the gentle version is slightly softer. Fits standard pillow case 27" x 18" (58cm x 46cm).