APEX CORE Wedge Pommel Gel-Foam CushionsRecommended for patients who are at risk for pressure ulcers, requiring posture support, hip positioning and or who are inclined to slide forward Wedge design helps prevent sliding while the pommel keeps knees separated to help prevent hip rotation High density beveled polyethylene core provides a firm foundation that helps eliminate sagging hammocking. APEX design features dual density foam layers for a soft top entry layer promoting direct interface