The Kool Chair features an ergonomic, perforated back that not only offers an attractive design, but it also allows enhanced circulation and airflow to keep you cool. The radius conforms to your back for maximum comfort. High-impact, polypropylene back and seat as well as the aluminum alloy back supports provide lasting durability. Cold-rolled, tubular steel frame provides sturdy support for lasting reliability. Nylon glides protect your flooring to prevent damaging hard floors. Stackable design allows you to stack additional chairs (sold separately) for space-saving storage. Permanent ganging is attached to the chair.