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Torsion Stack Chair

Product Overview

Features & Highlights

  • Torsion stack chairs provide unexpected comfort at a price comparable to fixed-back stack chairs
  • Patented torsion flex mechanism delivers flex back comfort, encourages movement, relaxation and enhanced circulation
  • Poly or upholstered
  • Arms, armless or tablet arm
  • Four-leg or sled bases
  • Stacks up to 6-high

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  • Seat and backrest are molded compound curved polypropylene with a textured finish
  • Torsion mechanism creates gradually increasing resistance over the full 12 degrees of back flex
  • Sled base is 16-gauge welded tubular steel; four-leg frame is 15-gauge welded u-shaped tubular steel
  • Legs are finished with baked-on, electrostatically-applied powdercoat paint or bright nickel chrome plating

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Product Story
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.

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Designer Profile
Giancarlo Piretti


Giancarlo Piretti

Giancarlo Piretti (Bologna, Italy, 1940) is an Industrial Designer. Among his successful designs are Plia folding chair, his best-seller exhibited at Moma NY, Platone folding desk, and DSC (106-AXIS) seating system. For Vertebra chairs he obtained the Compasso d'Oro (Italy) as well as for his largest project, Piretti Collection office & institutional seating system. Other designs include Xylon wooden chairs, Torsion collection of institutional chairs; Engage & Impulse office chair lines featured by a synchro tilt mechanism Piretti developed; #18000 nesting & stacking chairs; and the Strive chair collection. The Pirouette nesting table and Grazie and Doni chairs for KI U.S. are G. Piretti's latest designs.

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