Use the D-Roll to comfortably support the neck, back, knees, or ankles. The slim, compact size and versatility of this roll is ideal for home, work, travel, or while recuperating from an injury. This ergonomic roll reduces pressure on various body parts to help relieve pain. NECK: Use under neck to help maintain natural cervical curve when lying on your back. BACK: Use behind the back when sitting or lying down to help reduce stress on the spine while supporting the natural curve of the lower ba