The Marvin brand has two lines of windows and doors: Marvin and Integrity.
The Marvin line is a high end, made-to-order, custom window and
door line made entirely of wood or aluminum cladding. The Integrity
line is a pultruded fiberglass product. These Marvin lines are
celebrated for their beauty, energy efficiency and durability. Many of
these windows qualify for energy tax credits. In addition, they are
manufactured using sustainably harvested wood, and excess shavings and
waste wood materials are used to heat the manufacturing facility in
Minnesota.