The Zen Office™ A cyber space station * A floor desk work play station for laptop computers, writing, and reading. * Doubles as a chair for normal table or desk. * Act like a nerd but don't look like a nerd...takes the slump out of laptop use. * Vertically aligns body and eliminates back pain from chair sitting. * Active sitting effortlessly burns calories and tones the body as you do sedentary work. * Sizes: small 19.5 inches tall in front generally fits people under 5'4" medium 20.5 inches tall in front generally fits people 5'4" to 6 feet tall large 21.5 inches tall in front generally fits people over 6'