This Guynemer commercial grade mesh back stool has an attractive linear mesh material back which helps to prevent heat buildup.The back design is constructed to allow for generous lumbar support. This chair features a thick high density foam seat that is upholstered with premium mesh material for contract styling and quality. It includes a pneumatic gas lift seat height adjustment, a 25-inch black nylon base and hooded double wheel casters and a chrome footing. Customer assembly is required.