MH3SC: 16"W x 16"D x 3"HMH18SC: 18"W x 18"D x 3"HMH3SCM: 18"W x 16"D x 3"HMH3SCL: 20W" x 16"D x 3"H
3 Inch Seat Cushion provides maximum seat stabilization and pressure reduction while helping with better posture.