A prototype of the 2016 Mercedes-Benz C-Class Cabriolet has been spied undergoing testing while carrying the production-spec soft top.

A prototype of the 2016 Mercedes-Benz C-Class Cabriolet has been spied undergoing testing while carrying the production-spec soft top.

Scheduled to come out sometime next year, the open air C-Class is going to adopt a multi-layered soft top with a design that will likely mirror its bigger brother, the E-Class Cabriolet. It will likely be based on the forthcoming C-Class Coupe and compared to the standard sedan it will have a significantly smaller trunk.

Spy shots of the interior are not available at this point but back in July we saw a mockup of the cabin being exhibited at the Mercedes-Benz museum in Stuttgart. The cabin had a similar layout as in the sedan and estate but with reshaped seats as well as additional buttons for controlling the side windows and roof. In addition, it will also benefit from the AIRSCARF neck-level heating and AIRCAP air-deflection systems while the engine lineup will be largely carried over from the existing sedan and estate.

It is believed the Mercedes-Benz C-Class Cabriolet will be unveiled in September 2015 during the Frankfurt Motor Show. There's still no word about the C-Class Coupe which should normally be introduced before its open top sibling. AMG versions of both cabrio and coupe body styles will follow a few months later.

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Mercedes-Benz C-Class Cabriolet shows production soft top in latest spy pics