LOOKS THAT LAST. STYLES THAT STAND OUT. Style. Value. Dependability. When you're looking to make the most of your next project, count on Ply Gem Windows Pro Series. Our extensive product line provides you with the choices you want and the custom solutions you need. Designed with a deeper, full line frame, these windows are energy efficient, provide enhanced strength and stability and are virtually maintenance free. you'll not only enhance the view, you'll help bring a room to life.