JP-Australia developed the Welded Seam Technology to increase the durability and airtightness of our inflatable boards. The connection between the rail and the drop stitch material is hot-air welded, thus creating a very strong mechanical joint that turns these two parts into one. By fusing two different layers together into one part, the welding process makes the board safer and more durable. The plasticizers in PVC migrate over time and weaken the strength of the chemical bond of the glue. No more rail leaks!