The Tri-Core Cervical Pillow's unique trapezoid center gently cradles your head and supports the neck in its natural position to help alleviate the pain that accompanies numerous maladies. Made with premium Fortrel fiber. The Tri-Core is the #1 fiber support pillow recommended by the medical professionals who most commonly treat neck and head pain. In addition to alleviating pain caused by many conditions, airway blockage - a major cause of snoring - may also be helped. Most people experience an increase in sleeping comfort within a couple days of using this pillow. Others may require up to two weeks before the neck and back muscles adjust to their proper position. The Tri-Core fits a standard-sized pillowcase and comes with a white 100% cotton cover.