The 818 series see-thru style provides sturdy, flexible seat surface with air-thru comfort.  The metal backrest mount and four-function mechanism combine to create the first Space chair with seat slider and 3-position locking back with anti-kick. This is a must sit!  Whether upright or reclined the 818's bring a new level of sophistication to the Space Collection. | Office Star Products | | Executive High Back Chair | Black | Best Buy