The Milgard XO Window V400 is an energy-efficient, low-maintenance window that is designed to keep your home warm in the winter and cool in the summer. It features an insulated frame, dual-pane glass, and a low-e coating to help reduce heat transfer. Plus, its sleek, contemporary look will add a modern touch to your home's decor. Get the Milgard XO Window V400 for a high-quality and energy-efficient window you won't regret!