Both porous and compliant with the Americans With Disabilities Act, Gravelpave2 is made of recycled geotextile fabric attached to a 1-inch-high integrated ring and grid system. It is designed to stabilize loose aggregate. Gravelpave2 sits atop an engineered porous base and is filled with gravel. Typically the product is installed in parking lots, access roads, and trails. Invisible Structures Inc. www.invisiblestructures.com.