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The smart alternative to vinyl. Replacing, remodeling, or building? You can bring Andersen beauty, craftsmanship, and time-tested performance into your home for less than you may expect. Andersen® 100 Series windows and patio doors are made with the revolutionary Fibrex® composite material. This allows Andersen to offer uncommon value others can't. It's environmentally responsible and energy-efficient, and it comes in durable colors that are darker and richer than most vinyl windows.