It's a promise other door makers wouldn't dare to make: warp-free performance. Ultrex, a material so tough it takes diamond-imbedded blades to cut it to size, is use to create a virtually indestructible backbone in your door. A multi-point lock adds exceptional security and this French Door meets the National Wood Window and Door Association's highest rating. That's standard, not an add-on. No wonder we call it The Ultimate.