Fern’s Wave Suspension™ system is the heart of the chair and the key to its back comfort and flexibility. From all appearances, the back looks simple, but inside is a high level of science, engineering, and innovation. The Stem is a centred spine that supports a series of Fronds extending like leaves. Each Frond is calibrated to support a different area of the back, from the thoracic (upper back) to the lumbar to the pelvic areas. Back support is as constant as a person’s movement. The Cradle overlays the Fronds and Stem, working in concert with them for effortless support.