Dual firmness, molded polyfoam gives you a better seating posture and comfort at an affordable price. Mildly contoured foam (higher front and sides and lower back) reduces poor posture and slipping down in the wheelchair. Firmer foam across the front and under hips and legs for support, with softer foam under coccyx for comfort. Breathable, water-repellent cover is machine washable/dryable. Non-slip bottom with Velcro® patches keeps the cushion in place. Lightweight. Choose from 16"W x 16"D, 18"W x 16"D, 18"W x 18"W.