Our screens are manufactured with our exclusive, patented "Safe-Glide" Speed Reducer™. This hydraulically controlled device slows the screen return into the housing, assuring frail or small hands are not caught in the screen as it closes. It provides for a smooth retraction that prevents tearing of the material and abrasion of parts. The ClearView Invisible Screen Systems™ is the only brand offering a proven "Safe-Glide" speed reduction system. Others have tried to imitate it, but none have matched ClearView's superior quality and innovative design.