Mesh mid-back chair features a mesh back to mold to your natural curvature and aluminum frame armrests that adjust 2-7/8" in height. Arms are covered with a powder-coating for durability and soft polyurethane pads for your comfort. Dual-action synchro tilt allows the back to recline at a two-to-one ration to the seat angle so you can recline while keeping the seat cushion relatively level to the floor. Other functions include four-position tilt lock/unlock, seat-depth adjustment, 360-degree swivel and tilt tension. The 18-1/8" wide x 18-1/8" deep seat adjusts from 18-5/8" to 21-1/4" high and is upholstered with fabric. Back size is 17-7/8" wide x 18-7/8" high. 27-1/2" diameter, five-star base is made of nylon and is equipped with 60mm dual-wheel casters for easy chair movement. Weight capacity is 250 lb.