The SafeGuard30 roofing underlayment combines the proven technology behind asphalt based underlayments with a new high-performance nonwoven polyester reinforcement. The durability enables Safeguard30 to hold fasteners better and provide better tear strength and puncture resistance than synthetics or felt. Safeguard30 un-rolls nice and flat in warm and cold weather, weighs less than felt and provides greater coverage per roll, which all means time saved during installation. SafeGuard30 is the real roofers choice. A lightweight, easy to handle, nicely rolling, underlayment. Easy to install, and you get 4.5 squares to a single roll.