Two Sizes are Available Large Size: : seat back height: 27.5-31.5 inches, seat back width: 17.7-22.9 inches, seat length: 17.7-22.9 inches, seat width: 17.7-23.7 inches. Medium: : seat back height: 22.8-27 inches, seat back width: 16.5-21.7 inches, seat length: 16.5-21.7 inches, seat width: 14.9-16.6 inches. One size fits best! Please measure your office chair before placing an order.Elastic FabricEach desk chair cover is made of 90% polyester and 10% spandex, with enough flexibility. It is suitable for most computer game chairs.Design FeaturesThe fabric is high stretchy and anti-slip, durable. The office chair cover is designed with zippers. This innovated office decor is constructed with 1 Piece body and seat cover both together to provide effortless installment and provides two seperated arm covers.Decorate and ProtectRedecorate your office chairs, it will give your office chair a new look if your chair looks a bit broken or not so new. It will also protect your chair from further .UsageStretch office chair armrest covers can protect your chair from making by pets, children and dirty things. It can provide you a brand-new looking for your computer chair or swivel chair and help your enjoy your new life. The breathability feature can help your handle the sedentary situation easily, and it will not get wet when your sit on your office chair for a long time.Polyester,spandex