Bertioa Side Chair (Renewed)A classic, modern design that enhances any environment, Bertoia's side chair remains a fascinating study in bent metal and a fixture of mid century design. Knoll is the only authorized and licensed manufacturer of the Bertoia Collection which has been in continuous production since 1952. With proper care and limited exposure to the elements, the Bertoia collection unupholstered or with seat cushion are appropriate for outdoor environments.