The HydroShield Lifetime Synthetic Underlayment Samples are a 10 in. x 8 in. cut piece of the Hydroshield Lifetime (LT). HydroShield Lifetime underlayment consists of a woven synthetic material which gives it high strength, and has a double-sided slip resistant walking surface, giving roofers extra grip and added safety. It is UV resistant and can remain uncovered for up to 6 months. This underlayment won’t tear off, buckle or curl when it is wet, and it is 20 times stronger than asphaltic felt. A pre-printed nailing pattern and overlap lines speed installation, and this underlayment has a lifetime warranty that exceeds the needs of any final roof covering.