Your home is where your heart is. Whether you've lived in your house for three years or thirty years, you treasure the warmth, charm and comfort of your home. When windows show their age, there's no question you want the highest quality, most durable replacement windows available. You also want the window replacement process to be fast and hassle free. Marvin Windows and Doors - the name synonymous with quality, reliability, tradition and excellence - sets the industry standard by bringing you the Infinity from Marvin brand of replacement windows. The style and performance of Infinity windows and doors are steeped in Marvin's decades of design and engineering experience. And Infinity windows are made completely of Ultrex® - a pultruded fiberglass material that is superior to other window materials in virtually every category.

Ultrex® Fiberglass is 8X Stronger than Vinyl! Don't worry. Ultrex can take whatever mother nature dishes out because it's pultruded fiberglass, a material used in products where strength and durability are required. In fact, fiberglass is such a solid, long-lasting material that it's trusted for use in bridge construction.