Titanium underlayment is an air, water, and vapor barrier with a patented SURE-FOOT slip resistant nodular walking surface and an advanced resin technology that provided superior steep slope walk-ability. It is 6 times lighter and 20 times stronger than #30 felt. Has a temperature performance of -40°F to 240°F (-40°C to 115°C) and can withstand a 6 month UV exposure. It’s synthetic construction inerts mold growth and is 100% recyclable and it’s cool light gray surface, doesn’t expand or contract. Class A Fire ASTM E108, Meets & exceeds ASTM D226 with a 30 year limited warranty.