The Protekt O2 Wheelchair Cushion with hand held inflation pump helps to prevent and treat pressure sores. The soft, interconnected air cells allow for deep immersion for constant low pressure across the entire seating surface. The air cells are adjustable to 2" or 4". The dual valve compartments can be adjusted independently to increase positioning and stability for side to side control. Features a nylon breathable cover with non-skid bottom and safety straps. Size: 18" x 18" x 4".