Designed for durability during intensive use by individuals up to 300 lbs. Inflatable lumbar pump provides personalized back support. High-density memory foam seat with heavy-duty mechanical control allows hours of comfortable, continuous work. Five-star base has casters for easy mobililty. Casters supplied with this chair are not suitable for all floor types. Alternative casters are available to meet your specific needs. Chair Type: Rolling Chair; Folding/Stacking: N/A; Width: 21 in; Depth: 29 in.