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Integrity by Marvin

The exterior of Integrity products are made with Ultrex®, a pultruded fiberglass material with a patented coating process which is weather-resistant, strong, stable, and long lasting. The same amazing strength-to-weight ratio and tensile strength that make pultruded fiberglass perfect for use in ladders, bridge construction, and guardrails, make it perfect for durable, low-maintenance windows and doors.

Ultrex is superior to vinyl, vinyl-clad, and roll-form aluminum clad windows in virtually every category.

It’s eight times stronger than vinyl and almost twice as strong as well. It resists pinholes, striations, chalking, fading, scratching, UV degradation (to reduce fading and damage to upholstery and carpets), and can be painted dark colors, even black, without compromising its structural integrity.

Expanding at virtually the same rate as glass, the entire Ultrex window stays tightly sealed; no leaks, seal failures, or stress cracks.

Ultrex windows qualifies and exceeds the ENERGY STAR® performance requirements.

Our double-pane windows and Low-E coatings can reduce window heat loss and cut costs by 34% in cold climates, and cut cooling costs by 38% in warm climates. And Integrity from Marvin has over a decade of field installations to prove it.


  • I used to buy Marvin from another dealer but now buy all my Marvin products from Marvin Design Gallery. There is always someone there who answers the phone and they send great leads my way. My sales person, Steve Smock, has good follow-up and I think he's great.

    Tim Murphy, TMC Windows

  • Marvin Design Gallery replaced 19 windows in our home and they are beautiful. The contractor was fantastic, polite, cleaned up every day, and also smart with some tricky windows we had. We've recommended Marvin Design Gallery to others and are just really happy overall with how everything turned out.

    Kristen S. Winnetka IL homeowner