Integrity from Marvin is one of the top values for price and quality on the window market today. Integrity Windows and Doors are made with a virtually maintenance free, pultruded fiberglass material called Ultrex® Fiberglass.

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Ultrex® Fiberglass is 8x stronger than vinyl and is so durable and long lasting it is also used in bridge construction. Integrity products feature Ultrex® Fiberglass exteriors and your choice of wood or Ultrex® Fiberglass interiors.

Visit our showrooms or call 800-773-4803 for more information about ordering Integrity Windows and Doors.

Learn More About What Makes Marvin The Best Window Product Out There

Why Ultrex Fiberglass?

Ultrex Pultruded Fiberglass
About Ultrex Fiberglass

Ultrex is a patented pultruded fiberglass material pioneered by Marvin.

Ultrex is made by taking thin strands of strong glass cables and saturating them with specifically compounded resins. This material innovation was developed by Marvin and brings 20 years of unmatched experience, tooling and component optimization to every Integrity product.

Learn more about the strength and duribility of Ultrex at

Products and Options From Integrity 

Integrity Wood-Ultrex Windows and Doors

Wood-Ultrex Windows and Doors

With a strong Ultrex Fiberglass exterior paired with a rich wood interior, our Wood-Ultrex has both strength and beauty.

Wood-Ultrex Products
Integrity All-Ultrex Windows and Doors

All Ultrex Windows and Doors

Constructed with Ultrex from the inside out, our All Ultrex offers outstanding strength and durability.

All Ultrex Products

Warranty & Lead Time

Warranty includes 20 year on glass and  10 year on its other parts and pieces. Typical lead time is 14 days from time of order.

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Owner’s Manual

Download Infinity by Marvin’s Owner Manual for valuable information regarding the operation and care of your Infinity windows.

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Integrity offers glazing options, each can be used to maximize the energy efficiency of your project. Today’s standard glazing is LoEII with Argon.

Learn About Energy Efficiency

Integrity’s Inspiration Gallery

Use the arrows on the left and right side of the gallery to browse our Integrity images for inspiration and ideas on your next new construction, remodel or replacement project.

Integrity Red Diamond Achiever Program