#30 felt replacement used for steep slope roofing designed for use under all primary roofing types including; Asphalt Shingles, Synthetic Shingles, Metal roofing, and Cedar Shakes.; 11 times lighter and 14 times stronger than #30 felt; Class A Fire ASTM E108, meets and exceeds ASTM D226 Types I & II and D4689 Types II & IV; Class 4 hail rating; ICC ES Approved: synthetic construction inert to mold growth; Patented Sure-Foot slip resistant nodular walking surface, contributes to LEED points, certified minimum of 20% reclaimed content (100% recyclable); all temperature performance -40 F to240 F; 6 month UV exposure; cool light gray surface doesn t expand or contract; dual logo custom printing available; Roll size: 10 sq. or 93m .