The Integrity Marvin Fiberglass Window is made with Ultrex: tough, dependable, non-corrosive and low-maintenance. Plus, it’s 8 times stronger than vinyl.

Ultrex Construction

All Ultrex Series windows feature Ultrex construction inside and out. Beautiful, easy to use and as low-maintenance as a material can get, Ultrex® provides exceptional aesthetics and outstanding durability. It also exceeds standard ENERGY STAR-qualified performance. Six exterior finishes combine with pultruded fiberglass construction to offer virtually indestructible exteriors, while the low-maintenance classic white profiled interiors provide a beautiful classic appearance. It’s available in replacement AND new construction windows.