The seating in the 4000 series features automatic or manual uplift seat that allows for safer, wider seating rows when unoccupied. Expertly engineered for arenas, theaters, amphitheaters, convention centers, performing arts venues, and any other facility that requires high capacity seating. The durable X-Frame design and comfortable seating options make the 4000 portable folding chairs the standard folding chair among the most sought after arenas and venues across the country.