Ultrex® Fiberglass: Quite possibly the perfect building material.

Why choose Integrity?

Integrity windows are made with Ultrex®, a pultruded fiberglass we’ve patented that outperforms and outlasts vinyl, roll-form aluminum and other fiberglass composites. Marvin uses Ultrex and their proprietary pultrusion process to manufacture high-demand windows and doors that endure all elements without showing age or wear.

Integrity All Ultrex.

Integrity All Ultrex Casement windows are some of the best-built windows you’ll ever find. With a virtually indestructible Ultrex pultruded fiberglass construction, dual-arm roto gear operation and sequential locking system, you can count on dependable operation for the life of the window. These side-hinged windows feature large daylight openings, clean sightlines, and a great contemporary feel.

Integrity Wood-Ultrex.

Clean sightlines and smooth operation makes the Wood-Ultrex Casement window some of our most versatile windows. Add Round Top for an extra splash of sunlight or pair them with a picture window for a great view. The Ultrex fiberglass exterior stands up to the harshest elements, and the real wood interior delivers natural beauty.