Seat frame and armrest sleeves: monochrome polypropylene in basic dark or soft gray. Seat and back cover: Plano fabric or one of the 3D spacer fabrics Diamond Mesh (mesh look) or Silk Mesh (solid look). For Silk Mesh covers in soft gray, mauve gray and ice gray, the reverse side is in soft gray. For Silk Mesh covers in brown, nero and asphalt, the reverse side is in nero. For Silk Mesh covers in avocado, brick and dim gray, the reverse side is matched to the frame color (soft gray or nero). Cantilever base: chrome-plated tubular steel on glides. Non-stacking and stacking versions (max. 4 chairs).