REX Wrap® Plus is a high strength, woven and coated polypropylene weather-resistant barrier that provides for air infiltration protection as well as water resistance when used as a housewrap on the exterior sheathing. The micro perforations keep bulk water from penetrating the wall surface but serve as an aide in allowing moisture vapor the escape at a perfect rate. Also, you can only get the patent pending HI-VQ two color printing from Alpha Pro Tech engineered products, Inc. When the job calls for a housewrap REX Wrap® Plus is the builders choice.