SFS-3 LAGEN CONSTRUCTION is an optimal water repellent textile that is made up of 3 layers. The material is a special non-woven 3-layer construction, provided with a breathable membrane and is therefore substantially watertight. This special membrane ensures that the material has a breathable property. This allows condensation to "evaporate" easily. During the first rain shower the stitches must swell, after which the cover is almost watertight.