Eliminates the "head bob", gets you into a supported resting position. Vented so avoids rebreathing exhaled air. Doubles as a lumbar and back support cushion when not being used in the resting position. Some people can sleep anywhere and this will help them. Some people cannot and this will help them support their head while resting. So unique that it has its own US patent 7,788,751,B1. Its two valve and two chamber design allow infinite adjustments for firmness and height. Light weight, high grade flocked vinyl, stores easily in carryon bag. Provides privacy to user by concealing face while in use. Does not depend upon fellow passengers seat position to use properly.