The Berke Lounge Chair from Sunpan suspends its seating surface within a rigid metal framework using leather strapping that wraps around the iron structure. This tensioned approach creates a floating effect while the metal frame remains visible and structural. The straps extend across the back and under the seat, forming the primary support system while adding tactile detail. Metal buckles secure the leather elements, introducing industrial hardware into the design. The iron framework maintains geometric angles throughout its construction, creating strong linear elements around the soft seating areas.