Provides Protection for 20' x 20' Liner Underlay Kit contains one 15' x 20' piece and one 5' x 20' piece Uses for Underlayment: pond installation, landscaping, drainage fabric, erosion control and more This 6oz underlayment increases puncture resistance of 45mil pond liner by 400% Can be used as a heavy duty weed barrier for landscaping Can be used as separation fabric when paving, and gravel applications Fabric has extreme tolerance of Hydrocarbons, Freeze-thaws cycles, mildew and rot Our Geotextile Underlayment Fabric is consists of non woven Polypropolyne stable fibers which are heat set and needle punched for superior bonding. This extremely versatile underlayment fabric has a very high tensile strength. The geofabric underlay has great physical and hydraulic properties and is used for many commercial and consumer applications. Non-Woven Geotextile Fabric Pond and Multi-Use Underlayment Information: Material: Non-Woven stable Polypropolyene Fiber Filaments bonded by heatset and needle punched Resist: Tears, punctures, soil chemicals Features: Extreme tolerance of Hydrocarbons, Freeze-thaw cycles, mildew, and rot