Sometimes an exterior door needs additional protection from the demanding elements of Mother Nature. Developed for exterior doors that are subject to harsher environments, Performance Series® is a selection of heavy-duty door components that deliver maximum protection of your finely crafted Simpson door. We currently offer two Performance Series options, UltraBlock® and WaterBarrierTM Technologies. The combination of these two technologies creates a door suited for the toughest exposures. And this protection is delivered without sacrificing the charm and craftsmanship you've come to expect from a Simpson door. After all, a beautiful door is only worth having if you can protect it.