Synthetic Roll Roofing Underlayment 4' x 100' Repair Roll Blue Color Replaces 30# Roofing Felt Liner Lighter Weight and 20x Stronger than Felt, 30 Year Warranty! 20 times stronger than #30 felt: Can withstand higher wind conditions, preventing blow offs & tears Lighter weight than #30 felt: Provides fast and easy installation, allowing time and labor savings Ultimate anti-slip foot traction with unique tiger-skin texture results in safer installations Sticky gel-like, skid-resistant bottom layer coated w/proprietary formula to resist slippage Versatility: Can be used under all major roof coverings