Mobility on softness is the best way to describe the new Columbia Silhoflex upholstered mobile chairs. Combination of CAL133 compliant shell with CAL117 fabric provides the best option for a mobile chair in the 21st century learning environment. Smoot back, rib-less seat design with strategic strengthening of the transition area between the seat and the back creates the most attractive, durable and flexible seating option in the industry. Seat surface is equipped with a foamed fabric with concealed attachments. Chairs can be equipped with either compression or decompression casters as well as carpet, steel or felt glides.