Integrity Windows and Doors from Marvin

Integrity Windows and Doors are Built Tougher, Last Longer, and Protect Better

The enduring beauty of all Integrity products starts with Ultrex®, a patented fiberglass material that takes performance and durability to the next level.

  • Virtually no maintenance
  • Superior resistance to wind, rain, heat and time
  • 8x stronger than vinyl, as strong as steel
  • Beautiful wood interiors available
  • All products are ENERGY STAR® qualified

Integrity Windows and Doors made with Ultrex® pultruded fiberglass outperform roll-form aluminum, vinyl, and vinyl/wood composites in virtually every measurable category. While other windows might bend, break, or crack over time, Integrity windows hold strong and perform under great stress without showing age or wear.

Shop for windows and doors with the help of our 5-part video series hosted by Lou Manfredini.

This is a guide to help you understand what to look for in a new window or door by focusing on the most important categories: materials, efficiency, design and value. Lou Manfredini is a television/radio personality and home improvement expert. He is the host of House Smarts TV and a frequent contributor on NBC’s Today Show.