Adds 4¨ (10 cm) to the seating level. Weighs 3.3 lb. (1.5 kg).
Designed in conjunction with the OT/PT Rehabilitation Departments at the Hospital for Special Surgery in New York, NY. U.S. Patents 5,199,122 and 5,027,445, and covered by patents in Australia, Canada, France, Germany, Japan, Sweden and The United Kingdom.