Energy-efficient all-vinyl frame. Durable premium-grade acrylic provides privacy while letting in natural light. Insulated and double-paned for enhanced energy efficiency. Lighter and easier to install than true glass block windows. Silicone glazing is mold- and mildew-resistant. Ready to install and completely assembled for easy nail-fin installation. Safety glazed for use in the bath. Custom sizes and replacement-style frame options are available - call Lowes for details. Add style and value to homes of all kinds and make rooms inside feel bigger lighter and more inviting.