Active Contoured Ergonomic Support (ACES) provides support while perching to support your back at any sitting position. SertaPedic® comfort support cushion system with memory foam and pocket coils. Upholstered in a durable Culp fabric. Height adjustable arms for custom comfort. Pneumatic lift with tilt tension adjustment and lockout feature. Five-star nylon base with casters for easy mobility. American Chiropractic Association endorsed office seating.