With a choice of Dual or Single Tilt in Space or Standard Dual motors the C-air comes as standard with a fixed waterfall back cushion, but there is the option to choose from a range of seven removable and interchangeable back cushion styles to compliment the choice of nine removable and interchangeable seat cushions – each option being designed with different postural and pressure management qualities. These interchangeable options ensure that the chair can be easily adapted over time for changing conditions or new users, giving greater longevity of usage.