Vertical blind window treatments provide a practical and attractive solution for controlling light and providing insulation in any room. They reflect solar heat and reduce air conditioning costs by minimizing heat transfer passed through windows. Vertical blinds fabricated by Mariak offer a complete line of solid, perforated, textured, and embossed PVC louver patterns as well as several of the best selling stitch bond fabrics. In addition to a wide array of colors and patterns, a variety of valance and control options are available. The PVC louver materials contain UV inhibitors and provide room-darkening opacity to block sunlight.