Pen Fab now has a Clean Seam for your vinyl liner. We use RF vulcanized welding, which has been a proven industry standard since the introduction of vinyl liners, to create your pool liner. Implementing a new twist on this proven technology, we now provide a clean, foot friendly seam on the floor of your liner which will not only feel good, it will look good as well. No unsightly extrusion edge to catch and trap debris in your pool, which allows for better, more efficient use of your pool's filter system to sweep debris away and into the skimmer where it belongs...not laying on the floor of your pool, trapped along the seams of the liner. Not only is the Clean Seam better to see and feel, but it is stronger as well. Using this method, the liner seams are 27-33% stronger than the traditional 1/2" weld used throughout the industry. Your feet will thank you and you'll spend more time enjoying your pool and less time vacuuming as well!