Professionally advised, Peter Wernke 's team designs and constructs outdoor arenas throughout Europe. "Der Grüne Sand"® is a natural product and is guaranteed without aggregates. A computerized mix installation will assure you of getting a soil mixture especially for your needs. The footing is non-slip, elastic, grippy, (this is not a word) resilient and joint sparing. Individual mixtures can be used for every equestrian discipline.