TECHNOply is a 100\% synthetic woven roof underlayment offering high tear strength, a proprietary walking surface, and a 25 year warranty. Manufactured from post industrial recycled materials and 100\% recyclable for todays ecological building technology. Can be used under any final roof covering and warranted for 6 months UV (ultraviolet) resistant. 25 times stronger and 2.5 times lighter than felt. Pre-printed nailing pattern and overlap lines to speed installation. 10 square roll with 3" lap lines offers maximum coverage per roll for increased economy.