Gas height adjustment.
Supportive Visco Elastic memory foam covered with durable fabric.
Chair back included.
Overall width:16.5 Inch
Height range:22 Inch to 27 Inch
Seat size:16.5 Inch x 14 Inch.
Knee cushion size-16.5 Inch x 9.5 Inch.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.