Viola Alternating Cushion System...The Viola alternating cushion and pump can work alongside the Tamora alternating mattress overlay or independently to provide superb care to the patient. Specifically designed to deliver a high degree of care for the patient, this competitively priced pressure relieving system is suitable for medium to high risk pressure ulcer treatment. To set the system for the optimum performance, the user can control the comfort using the control knob whilst seated. Pressure indicators which are visible on the control unit identify when the pressure has reached the preset level and warn the user that the pressure is below an acceptable level.The cushion is provided with a two-way stretch polyurethane waterproof and vapour permeable cover, reducing shear and friction. Consists of a pump, a seat cushion, a foam support base and 6 alternating cells.