This stool has a frameless 3D Intelligent Suspension back that allows freedom of movement, while providing targeted back support and moving heat away from the body. The suspension is supported by a Y-tower and anchored at the bottom by the ArcSpan. The stool has an upholstered seat with foam padding and an upholstered Posturefit back support. The Synchronous tilt provides continuous balance and lets the body recline naturally, pivoting at the ankles, knees, and hips. This matching group of stools have fully adjustable arms, adjustable seat depth, foot ring, and back tilt lock.