The Wal-Pil-O is really four neck pillows in one. Each pillow has two different borders (narrow and wide), and two types of center sections (soft and medium). The 4-in-1 anatomical design helps relieve discomfort from tension headaches and arthritic disorders of the neck, while reducing nocturnal and early morning pain. Properly supports and aligns the head and neck while lying on the back or side. Full-size, rectangular, therapeutic pillow fits standard pillowcase.