Used Mirra Chair- by Herman Miller Possibly the most comfortable chair today, takes a giant leap into the future with its automatic shape adjusting technology. The pliable elastic Tri-Flex back, supports the entire spine and conforms to size, posture, and movements. Only a few simple seating adjustments fine-tune the fit and feel. The PostureFit camber shape at the base of the back promotes a healthful and comfortable support to the lower back below the beltline. The Mirra is a design that was achieved with international cooperation by Herman Miller and Studio 7.5, a German design firm. It’s also certified, 96% recyclable and 42% fabricated with material derived from recycled resources.