Porous Pave has refined the size of recycled-rubber chips used in its surfacing. Chips now range from 1/8 to 1/4 inch, creating a porous, durable, and flexible pour-in-place permeable paving material. The finer grind retains 93% of the porosity of the coarser material, which is still available for some applications. Ideal for courtyards, patios, and walkways, Porous Pave XL offers a 50/50 blend of rubber chips with aggregate for installed thickness of 1 to 2 inches. Porous Pave XLS has a 100%-recycled-rubber chip content. The $5 average per-square-foot price depends on material and thickness. porouspaveinc.com