Also called Geosynthetic clay liners, It is used to be composed of an intermediate layer of bentonite or other very
low-permeability material in between two layers of woven /non-woven geotextile mechanically held together by needling, stitching, or chemical adhesives.

Bysandwiching a bentonite layer with certain qualities between two geotextiles (often using needle punching procedures), Geo-Clay-Liner barriers are composite materials created. When hydrated, this composite can offer a lining system with a very low permeability that can be used to create geological barriers and waterproofing systems. This composite can also be laminated with polymeric films or thin membranes to increase its tensile strength and lower its permeability for more demanding applications.