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Design by
de Sede Design-Team
Bart Van der Heyden
Revolutionary seating concept

DS-343 is an armchair that moves when the person seated moves – because the object is constructed not with a classic seating surface that stops at the backrest, but with one that extends to the height of the pelvis. If one leans backwards, the backrest element, from pelvic height on up, automatically moves along with the user – without any mechanical effort, and solely as a result of the change in the posture of the person seated. And the design is equal to this revolutionary seating concept: the silhouette of the wing chair is defined by the skillful folding of the leather. Dimensionally stable NECK leather in thicknesses of up to 5 mm is skillfully processed by hand to ensure that it continuously cascades over the edges.
1. The armchair seat shell is extended to pelvic height. This ensures an ergonomic sitting posture.

2. If you lean backwards, only the upper part of the backrest moves backwards. This provides gentle support to the spine, and the chest opens automatically. This creates a liberating seating comfort.

3. In addition to the backrest, the seat shell automatically tilts backwards to achieve an even better lying and relaxing position. This innovative movement mechanism is patented.

DS-343 Video Paragraph


  • DS-0343/05
  • DS-0343/01
  • DS-0343/21
All available articles


Material & colors chairs

  • NECK



Natural Nappa leather


up to 5 mm


An innate natural quality with an incomparably distinctive, even rustic, aura; it is a true eye-catcher – simply incomparable. A cover made from NECK requires an entire section of hide for each back, side and seating element. When joined, it creates a so-called optical stitch seam: a piece of art from de Sede craftspeople that requires unsurpassed skill.

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DS-343 sculpture (PDF)