From healthcare to education to business, the Torsion® collection, designed by Giancarlo Piretti, offers superior comfort via flex back at a modest price. Torsion stack chairs provide the comfort of passive ergonomics at a price comparable to fixed-back stack chairs. Perfect for any application, Torsion stack chairs are available in three frame styles - full sled base, cantilevered sled base and straight four-leg. Available in armless or armchair versions with two types of tablet arms available with the full sled base and straight four-leg frame.