The tiny and foldable original rear seat of the Cruiser looks good, but is not what many would consider a comfortable seat. Therefore BMW has the option of the "Comfort" seat. When fitting an original BMW Comfort rear seat this rail can be fitted to provide a back rest and grab rail for the passenger. The original BMW folding rear seat/backrest (not supplied) which is no longer in use when fitting the Comfort seat, is fitted to provide a back rest for the passenger. The overall appearance of the Cruiser is enhanced by the C Back, and the passenger has a nice back rest to lean against. The "C Back" can be used together with the original side cases. Made of strong steel tubes and chromed.