Hardshell is a stronger outer layer that is supposed to provide much better water resistance while maintaining good breathability. Both of these parameters are combined in the Squall Jacket with a three-layer TorrentStretch® membrane developed by the Helikon-Tex specialists. Between the stronger outer layer and the integrated lining is a microporous membrane. Their dimensions stop water from penetrating inside the jacket. At the same time, they are large enough to effectively remove moisture (in the form of water vapor) generated by the body to the outside.