Marvin Fiberglass Window Lines:

Integrity Ultrex - This is the Integrity window that is made of solely fiberglass. Marvin's name for its pultruded product that it manufactures is "Ultrex" so their windows are not named after anything other than the material that comprises them. Just like all other fiberglass window lines, these all-Ultrex windows come in all imaginable styles, and customization is definitely an option.

Integrity Wood-Ultrex - This fiberglass-cwood clad window serves as the hybrid between a durable and practical fiberglass window on the exterior, and the classic and visually appealing wood on the interior side. This window, like the Ultrex window, is available in a variety of finishes, colors, and glass options.

About Marvin Windows:

When Marvin grew into being one of the top manufacturers of fiberglass windows, they branched out, as most others did, into the production of fiberglass windows that could be more durable and less maintenance than vinyl windows, but just as attractive as wood windows, and ten times more energy efficient. Integrity fiberglass windows by Marvin have many patents and more to come to its name. The windows are continuing to be more and more energy efficient as well, especially with the ever-changing tax credit and ENERGY STAR standards.