Pella® Skylights are traditional in every detail—with all the Pella innovations you demand. The Skylights feature polyvinyl chloride (PVC) at the sash and frame. The frame is made of select softwood that is preservative-treated to resist damage from water and insects; plus a condensation gutter pulls water away from the window. The low maintenance aluminum-clad exterior is a Hassle-Free™ way to protect your investment. We maintain our high standard of energy efficiency with our heavy duty EPDM double air seal frame gasket into the frame.