The Curve Wheelchair Cushion is made of high-density molded foam to reduce potential high-pressure areas. The contouring on this cushion is defined so it will maintain its shape even during prolonged use. This cushion also has a mild anti-thrust shelf to prevent forward migration. The medial and lateral thigh supports will promote proper leg alignment for better posture. This cushion is meant for those with a low risk for skin breakdown. Available in 3 different sizes: 18" x 18", 20" x 18", 16" x 16". Has a 250 lbs. weight capacity.