The Titanium UDL25 is a highly engineered, mechanically attached, coated woven synthetic roofing underlayment designed for sloped roofs. UDL25 represents the future in felt replacement technology, and used in conjunction with Titanium PSU30 self-adhered underlayment, offers the sloped roofing industry a truly revolutionary system of safety, security and simplicity. It's advanced polymers combine to deliver a unique gray synthetic roofing underlayment that can be used under all types of primary roofing materials to replace #30 felt. Unlike smooth surfaced underlayments, UDL25 possesses a revolutionary patented slip resistant Sure-Foot® nodular walking surface technology that allows for easier steep slope walkability, even in wet conditions. Unlike felts, UDL25 does not dry out, leach oils in the heat, nor does it become stiff, difficult to roll or crack in the cold. UDL25 is 14 times stronger than #30 felt. Less material damage and waste during installation and fewer post-install repairs result in significant savings in time and money. This product will continue to protect your high cost, long life rated, primary roofing long after oil saturated felt products have turned to dust.