ERGONOMIC DESIGN: Features an innovative air track system and all-around neck support that keeps your head stable and comfortable during travel.VERSATILE SUPPORT: Structured chin support and targeted neck cushioning work together to maintain proper alignment in any seated position.COOLING COMFORT: Premium ice-cool fabric covering helps regulate temperature and provides a refreshing feel during long journeys.ADJUSTABLE FIT: Customizable drawstring closure allows for personalized comfort and prevents head from falling forward while sleeping. Perfect for airplanes, cars, trains, or any travel situation.Small Size is ideal for average adults measuring neck size between 14" and 16". Large Size is ideal for larger necks measuring neck size above 16".