Marvin windows are solid. They are a more heavy duty window than other window companies. Their side rails are beefy and their frame reinforced. We like using Marvin Ultimate Inserts in many oversized window projects.
Beautiful solid wood interior available in six wood species (Mahogany, Cherry, White Oak, Vertical Gain Douglas Fir, and Pine)
Marvin windows are attractive, with a bead molding surrounding the glass. Their lines are clean and smooth.