Backrests for the Otello 18, Otello, Otello orthopaedic and Santiago models are available in three different versions. The Semplice backrest is an iron frame which screws onto the upper section of the mechanisms. The Doppio version consists of an iron frame with belts in the backrest section, which doubles up as a cushion holder. The Doppio Diviso version is an iron frame with belts in the backrest section which is divided into two, creating two cushion holders. This division makes it easier to individually pad the back of the sofa.