Two layers of premium high resiliency foam provide increased comfort and decrease the probability of pressures sores. Leg adductors in conjunction with medial thigh separator and deep leg troughs, promote proper leg alignment and reduce hip rotation and pelvic obliquity. Waterfall front reduces pressure behind the knees and thighs. Has round large radius bottom provides versatile surface for sling or flat seated wheelchairs and the coccyx relief cutout unloads bony prominences. Removable Solace™ cover is fluid-proof and provides multidirectional stretch and helps protect against shear force. The QuadraGel pack has four compartments to prevent gel migration and provide optimal distribution of body weight. Front 4.5"H x Rear 3.5"H. Abductor is 5.5"H.