Adjustment System: Ergonomic "Ease Adjust" system allows you to adjust the back & pneumatic height from a seated position. Seat: Ergonomically contoured waterfall seat for improved circulation. 19"w x 18"d x 3"h. Back: Lumbar back support 16"w x 12"h with scuff resistant back panel adjusts four-ways: up, down, forward & back for a personalized fit. Height: Medium Bench Height 20-27" Base: Durable 5-leg 24" diameter fiberglass reinforced nylon base. Casters: Black dual-wheel, self-braking, non-marring casters designed for both hard and carpeted floors. These casters feature a safety lock that engages when no weight is applied, preventing the chair from sliding when sitting down or standing up. Weight Capacity: 300 lbs This line of medical chairs from Perch Chairs & Stools offers extraordinary durability and excellent comfort for anyone in the medical field. It’s also available in a variety of colors and styles to suit any room. No more jockeying for the right position to reach the seat lever. The ergonomically contoured waterfall seat was designed to improve circulation and comfort. With the "EaseAdjust" system at its core you can quickly and easily spin, raise or lower the seat; as well as adjust the lumbar back support up, down, forward and back. And we don’t skimp on comfort, either: 3 inches of foam separate you from the supportive base of the chair. We’ve seen other chairs fall apart almost out of the box. Bad welds, cheap casters, poor cylinders – they’ll do your chair in quickly. That’s why we place so much importance on build quality. This model employs reinforced fiberglass nylon and steel to make sure you can trust your chair for years to come.