HX-DCH-015 is defined by a back that sweeps forward around the sitter rather than meeting separate applied arms. The armless version keeps circulation clear and supports denser table planning, while the arm version adds a more enclosed seat for end positions or lower-density dining rooms. Both share the same tapered leg language and visually lifted seat, so they work as coordinated variants rather than competing models. The open space beneath the shell also reduces the sense of mass when many chairs are repeated across a restaurant. For a project schedule, buyers can mix the two variants around one table plan, then hold upholstery and leg finish consistent. Seat height, table apron clearance and the exact arm position should be confirmed from the layout before quotation.