Dirt, dust and stains pose a real problem to jackets and trousers with a functional membrane. Soiling can influence the breathability of a functional jacket; when the membrane is absolutely watertight, waterproofing prevents the top layer from becoming saturated. This wears off with soiling and consequent cleaning - this happens more quickly with heavy use. It is precisely for this purpose that Engelbert Strauss has developed work clothes with functions. Regular brushing and washing of functional clothing cannot be avoided during the course of work - and are also important for maintaining functionality. Regular cleaning and care extend the lifespan of functional jackets and trousers and revitalise lost functions. We therefore recommend that, for professional use, you waterproof clothing after each wash to prevent penetration of normal soiling into the fabric.