Greenview windows have a contemporary exterior sash, a choice of Vertex3™, Sol-R® Gain 180, Sol-R® Shield plus 366 glass, Triple weather seals, Intercept® ULTRA Warm-Edge Spacer System for a less conductive, longer lasting, and more energy efficient window, Fully welded sash and frame, Sash & frame feature multi-air chambered cavities, Black co-extruded gasketing for improved aesthetics and to resist discoloration, with NEW fully extruded black options.