Palumbo Patella Tracker Small Medium Stand Up Assists 20 X 18 * The Instrument and Solution Stands 20 X 18 * 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 ve come to expect from Chattanooga with the safe effective deep tissue heating therapy of shortwave diathermy 8 thick neoprene 3 below Mid Patella: 11 1 2 to 13