Proactive Medical Protekt Seat Relief Alternating Pressure Seat Cushion System Flotation Devices Its robust construction ensures long term Options:Relief Slipper for Walking Medium Large Its robust construction ensures long term durability in high traffic or mission critical environments where equipment failure is not an option the chair shifts the patient's center of gravity without changing the hip or knee angle heavy duty neoprene air bladders that alternate pressure under the pelvis at selectable clinical intervals Dedicated Placement Static Function: Includes a one touch static mode that instantly stabilizes and hardens the air cell matrix uniformly