Colors: Black, Blue, Grey, RedGas height adjustment.BifomPad technology featuring a supportive base foam with a layer of memory foam covered with durable 360 degree stretch fabric.Chair back included.Overall width:16.5"Height range:22" to 27"Seat size:16.5" x 14"Knee cushion size-16.5' x 9.5"WARNING This product can expose you to chemicals known to the Stateof California to cause cancer and/or birth defects or other reproductive harm.For more information, please visit www.P65Warnings.ca.gov