LayerLock™ Technology — Proprietary technology mechanically fuses the common bond between overlapping shingle layers. Up to 99.9% nailing accuracy — The StrikeZone™ nailing area is so easy to hit that a roofer placed 999 out of 1,000 nails correctly in our test. WindProven™ Limited Wind Warranty — When installed with the required combination of GAF Accessories, Timberline® HDZ™ Shingles are eligible for an industry first: a wind warranty with no maximum wind speed limitation. Our legendary Dura Grip™ sealant pairs with the smooth microgranule surface of the StrikeZone™ nailing area for fast tack. Then, an asphalt-toasphalt monolithic bond cures for durability, strength, and exceptional wind uplift performance. StainGuard® Algae Protection — Helps protect the beauty of your roof against unsightly blue-green algae discoloration.