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No chair has flown higher than the Nada-Chair's premier product, the Back-Up. It has launched into space with the astronauts where they use it to ease micro-G induced back pain. But it's down-to-earth function is keeping computer users sitting comfortably upright all day. Sedentary work has made us "terminal sitters". The BackUp provides well-cushioned support for perfect posture. This "flagship" product of our line has twice as much padding as the next-in-line S'portBacker. The BackUp includes the CushShin accessories (sold separately for other products at $17) providing three times wider dispersion of pressure on the shins. Meditators who sit still for long periods as well as larger framed individuals find these very helpful for long-term comfort.