Waterproofness is a technology that ensures rain drops don’t penetrate a material. This is achieved using high-performance fabrics.  The basis is a water-repellent DWR finish on the surface, with polyurethane lamination or coating on the bottom. Waterproofness is indicated as WP: water column in millimetres. According to the relevant ISO standard, a material can be labelled ‘waterproof’ if it has a water column tolerance of 1300 mm. The combination of multiple methods improves fabric functionality. Materials with this technology are suitable for wet environments, and designed for sports in adverse weather conditions