This footrest features three-level height adjustment and is suitable for use in narrow seats. - Model Name: Easy Inflation - Features: 3-level height adjustment - Application: Footrest - Sales Volume: Exceeded 5,000 units - Compatibility: Suitable for narrow seats I purchased two for a long-haul flight, but only used one, so I am selling the unused one. It has been stored in a drawer at home. Thank you for looking.