PB Deep Back Foam: Molded foam wraps around shell for maximum comfort and protection Includes removable positioning sacral/lumbar support pad Outer cover: Moisture resistant and breathable Optional privacy flap is available Back shell: Contoured shell provides exceptional midline support and positioning - Durable, lightweight ABS back shell includes 7” contour depth and built-in plate for headrest attachment Hardware: “Easy Set” hardware installed and adjusted in minutes – adjustments can be made while user is seated in the wheelchair