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12' X 25' Underlayment is a non woven fabric that is used under your liner it will help protect the liner wall from punctures from stones and roots.

12' X 25' Underlayment is a non woven fabric that is used under your liner it will help protect the liner wall from punctures from stones and roots.

Underlayment is a non woven fabric that is used under your liner it will help protect the liner wall from punctures from stones and roots.