As our most popular series with our longest-standing products, the 400 Series product line brings you the best overall blend of performance and style to satisfy just about any window or door need. With years of engineering and craftsmanship to build on, these windows are designed to live up to your high standards. Our 100 Series product line is engineered with Fibrex® composite material for durability, sustainability and energy-efficiency. It's twice as strong as vinyl and provides low-maintenance exteriors with clean corners for a refined look.