Roof Underlayment Pro-Grade #30 felt replacement used for steep slope roofing designed for use under all primary roofing types including; Asphalt Shingles, Synthetic Shingles, Metal roofing, Tiles, Slate, and Cedar Shakes.; 6 times lighter and 20 times stronger than #30 felt; Class A Fire ASTM E108, meets and exceeds ASTM D226 Types I &amp; II and D4689 Types II &amp; IV; Class 4 hail rating; ICC ES Approved: synthetic construction inert to mold growth; Patented eSure-Footee slip resistant nodular walking surface, contrib ROOFING UNDERLAYMENT Wdth In x Lgth Ft=48 x 250 TITANIUMe UDL 30 SYNTHETIC