PDP Features video "SuperTerrain Slide Serrations" discussed the benefits of this design. In Long - The SuperTerrain Serrations are uniquely designed protruding serrations on the slide, allowing for quicker and more responsive hands-on engagement with the pistol. Instead of the standard subterranean cuts that are cut into the surface of the slide, Walther has broken the mold with a SuperTerrain design to raise the serrations above the surface of the slide offering a new more positive feel to operating the action. When you go to make READY, you will feel the difference the instant you put your hands on it. SuperTerrain = Above the surface. The serrations are above the surface of the slide making them easier to grip while keeping slide mass to a minimum. Link to PDP: https://waltherarms.com/pdp/