Depending on the intensity of use, weatherproof jackets and functional trousers should be waterproofed after every wash. Whether through wash-waterproofing or with a special waterproofing spray for textiles after every wash. It’s easy to check whether the waterproofing is still intact: Spill a few drops of water on the functional textile and wait to see if they are absorbed. If they bead off, the waterproofing is adequate.