The Office Master Executive Chair features a taller back than the regular OM5. This ergonomic office chair is a self-weighing chair that balances itself based on user weight. Since each body is unique, the chair intuitively responds to a wide range of body weights and sizes without needing manual tension adjustments. Larger built individuals with more upper body mass will find this taller-backed chair more comfortable. Individuals with longer legs would prefer the XT version of the OM5 chair.