Hardshell jackets feature a membrane layer. This membrane seals the jacket against external water and water, while allowing water vapour to pass to the outside. Gore-Tex revolutionised the entire outdoor world with this technology in the 1970s, but nowadays, many other manufacturers combine wind and weather protection with high breathability. The breathability and water column may vary slightly from one supplier to the next, however, what all hardshells have in common, is that the fabric permanently retains its performance. Finally, you’ll need to consider the quality of workmanship, individual wear-resistance requirements, weight and details such as pockets.