The Welded Seam Technology has been introduced two years ago and proved to be successful. The hot-air welding process creates a very strong mechanical joint that literally fuses two parts into one. Therefore this technology is superior to standard gluing (the plasticizers in PVC migrate over time weakening the strength of the chemical bond of the glue). This welding process of amalgamating two different layers into one makes the board safer, lighter and stiffer.