Heated seatbelts sound like a futuristic gimmick, but Mercedes has put real engineering behind them. First shown on the brand’s Experimental Safety Vehicle concept, the system uses tiny heating elements inside the belt that can warm it up to body temperature in just a few minutes. On chilly days, this means occupants are more likely to buckle up right away without wearing bulky coats, which helps the seatbelt sit properly for better safety.

The belts work automatically alongside the car’s heated seats. In the concept version, built in sensors in the belt managed temperature, while newer versions use the car’s climate sensors to adjust heating. Mercedes claims this simple idea helps keep passengers comfortable and safe, especially in colder climates.

There’s another advantage to these heated belts that might not be obvious at first: they can help electric vehicles go farther in the cold. By warming up passengers directly, the system reduces the need for full cabin heating, which draws power from the battery in an EV. According to supplier ZF, their Heat Belt tech can improve driving range by up to six percent in winter conditions. The belt itself heats up in under two minutes, and smart sensors make sure it only uses as much energy as needed.

While this feature is clever and could save energy, Mercedes is not likely to make it standard on every S-Class. Expect it as an extra-cost option, just like the brand’s heated armrests and door panels. Still, for luxury buyers who want the latest comfort tech, heated seatbelts are another way Mercedes keeps the S-Class ahead of the curve.