46G-1616-B Size: 16" x 16", Thickness: 2" Features: -Comes standard with a quadrangle pack that has four compartments designed to prevent gel migration.-Helps reduce shear force.-Quadra gel pack is a polyurethane bladder with four compartments.-Provides optimal distribution of body-weight.-Maintains skin integrity and seated temperature to provide maximum comfort.-Available in 2'' and 3'' thicknesses. Construction: -Single-layer foam construction contours to the users body, reducing high-pressure areas.