Polycore shutters integrates innovative technology and traditional craftsmanship. Having aluminum core reinforcement makes them the most durable shutters on the market today. They are fire retardant, moisture resistant, extremely energy efficient, and are guaranteed not to warp, crack or split. Did we mention they look good too? Being one of the largest distributors of Sunland Polycore shutters, make Affordable Window Coverings an excellent source for getting a great price on a product that will last a lifetime.