The Invacare Matrx Stabilite Wheelchair Cushion is a hybrid positioning cushion with a foam base and Invacare ThinAir bladder; a comfort and shear management layer. The outer cover is moisture resistant and breathable. The inner cover is 4 way stretch to allow emersion and air circulation. Built up rear posterior corners, contoured medial and thigh supports, trochanter and sacral cutouts and, a rear wall for post postural support.