Comfort and posture. Ibex™ is available in mesh and upholstered chair and height adjustable stool models. Adjustment options include synchro-tiler, multi-tiler, tilter and task mechanisms (chair models only). Features include height adjustable arms with durable self-skinned urethane armcaps; lumber support with height adjustment; dual wheel carpet casters,; pneumatic seat height adjustment. Designed by Zooey Chu.