Featuring our Patented S-Shape Seating Frame, the S-Ergo series is the original and authentic Ergonomic wheelchair in the wheelchair industry. Aircraft grade aluminum is the primary frame material which boasts a limited lifetime warranty, and 1 year on parts. The S-Ergo series features Ergonomic design on the seat, backrest, armpads, brake handles, and handrims. S-2512 series specifically feature removable and height adjustable footrest, high quality durable seat and back upholstery with built in padding, push to lock brakes with built in 2″ extension as well as companion brakes and a super compact folding frame for ease of travelling.