NYOrtho APEX Gel-Foam Wheelchair CushionsThese cushions have a gel pod close to the top of the cushion to provide a cool interface between the patient and chair APEX design features dual density foam layers to provide a soft top entry layer for direct interface with a cooling gel pod and a higher density base layer for support and pressure distribution Breathable stretch removable cover is made of a pressure reducing fabric that promotes healing via active evaporation of moisture and cooling