RamDrain EN 36R is an entangled net prefabricated composite drain 0.45-inches thick, “zig-zag" geometric patterned core, drainage mat with a layer of non-woven geotextile on both front and back of the product. RamDrain EN 36R has a 3-inch (76.2 mm) fabric flange beyond the core to provide overlaps with adjacent drainage courses.