Infinity® replacement windows by Marvin have set the industry standard for replacement windows by using Ultrex®, a pultruded fiberglass material that will outlast and outperform any other material. Ultrex® is so durable that it is used in bridge construction, and it never needs to be sanded, scraped, or painted. Infinity® replacement windows provide an insulated barrier against outdoor weather, while helping to conserve energy. Infinity® windows are "no worry" double hung windows. With old double hung windows, it can be a task just to open them, and the Infinity Double Hung is the smart answer to a traditional favorite. You'll be amazed at the smooth, effortless operation. The quality hardware and advanced design result in a double hung window that makes cleaning a breeze. Attractive, virtually maintenance-free, and professionally installed Infinity® replacement windows will give your home the facelift it needs.