Polyfibercrete™ is a revolutionary lightweight blend of materials which retains the strength and value of concrete while offering exceptional texture for climbing. This texture is the result of thousands of micro bubbles embedded throughout the material. At the surface, these bubbles are exposed, providing a sure grip without being abrasive to the skin. This texture is part of the material - it is the same on the surface as it is 8 inches deep, which means your climbing texture can never be worn off.