SwiftGuard® is a high-performance synthetic roof underlayment for all steep-slope roofing materials including tile, steel, and shingles, as well as natural and composite slates and shakes. SwiftGuard® Roof Underlayment includes innovative, patented nail gasketing technology for superior moisture resistance. A high grip backing and non-woven, thermally embossed facer provide increased deck grab and superior walkability. Each roll is approximately 10 squares (1,000 sqft) making installation Swift and easy to Guard against the elements.