Palumbo Patella Tracker Small Medium Stand Up Assists shelf capacity * Drawer is Color:Yellow shelf capacity * Drawer is 15 W x 15 D x 4 H * Aluminum legs with rounded corners & clear protective finish * Easy roll 3 swivel casters * 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 * Lateral elastic insert in patella strap repositions pad according to knee's ROM 8 thick neoprene