Another Mammut innovation for the zipper. The zipper spiral is attached directly to the outer material. This innovative approach saves weight, avoids unnecessary tapes and lots of perforated seams which would require sealing. Thanks to its design, this exclusive Mammut zipper is extremely easy to use and so flexible you hardly notice it is there. For the mountaineer, this offers the added benefit of making the jacket smaller and easier to compress for packing. The zip can also be operated easily, even in demanding situations.