Roho Cushion Hi Profile 15 x18 X4.25 Single Valve Wrist BP Monitor 18 X 16 * The stretchable sides so you 18 X 16 * The contoured design combined with the simple operation of the ISOFLO© Memory Control unit offers provides a new level of postural control and stability that has never been achieved in an air cushion * The contoured design positions the pelvis back in the wheelchair and centers the individual comfortably in the middle of cushion * The ISOFLO Memory Control unit locks air into each of the four compartments providing stability by minimizing side to side and front to back motion * Adjustable to individual 5 tall * The easy to release lever mechanism is conveniently located under the front armrest support frame * This unit is ideal when being used with a wide range of patients with it * 2 year warranty