Why Are
Integrity Fiberglass Windows
Better Than Vinyl?

At some point an innovative manufacturer takes a risk on a product that ends up changing the face of the industry for good. When it comes to windows, Marvin has done that with Ultrex fiberglass. 8x stronger than vinyl and with far greater design flexibility, Integrity Ultrex is the perfect window making material. As we wait for the other manufacturers to catch up, we’ll continue installing the absolute best window ever made.