Batman's Batsuit is changed in "The Dark Knight" (2008) due to Bruce Wayne's growing frustration over his overall lack of mobility (leading to an incident where he gets mauled by dogs while breaking up a drug deal). In this new design, the bodysuit is made of hardened kevlar plates on titanium-dipped tri-weave fibers and is broken into multiple pieces of armor over a more flexible bodysuit for greater mobility. But as a trade-off, the flexible armor leaves Batman more vulnerable to injury from knives and gunfire in favor of increased flexibility and lighter weight. While the cowl of the Batsuit in previous film incarnations has been attached to the shoulder and neck, the Batsuit's cowl is now a separate component inspired by the design of motorcycle helmets, allowing the wearer to freely swivel and move his neck without moving the rest of his upper torso (by Bruce's personal request to Fox as 'it would make backing out of the driveway easier') as was characteristic in all the previous cinematic versions of the Batsuit. Also, a strong electric current runs through it that prevents anyone except Batman from removing it, to further protect his identity.