Snow and ice don't seem like the natural habitat for a convertible, but automakers must make sure the components can withstand all weather conditions. That's why a prototype BMW 4 Series Convertible has been spotted by our spy photographers taking a spin in the snow. Thick layers of camouflage still cover the exterior, but at least the car is wrapped up warm for the cold.

As you can see from the photos, BMW has finally ditched the previous model's folding hardtop roof in favor of a more traditional fabric soft top. Even though the car is heavily camouflaged, the fabric roof improves the car's looks while freeing up some trunk space and is also lighter and cheaper to produce.

Other design details are difficult to make out, but an earlier sighting suggested the grille will look similar to the one found on the new Z4. The new 4 Series will also ride on BMW's CLAR platform, which should result in a significant weight reduction, a more spacious cabin, and a larger trunk.

Inside, previous spy shots have confirmed the interior will be getting a welcome upgrade, with a new dashboard that looks identical to the one in the new 3 Series and Z4 featuring an updated iDrive system, a new shifter, digital gauges, and new switchgear.

In terms of engine options, the new 4 Series should share the same powertrains as its 3 Series sibling, so expect it to be offered with 255-horsepower four-cylinder and 382-horsepower inline-six engines. Both the 4 Series Coupe and Convertible are expected to debut in 2020, but we should see some more revealing spy shots before then as BMW continues testing.