The designers of Zip Yosemite, Experience Based Learning, focuses on adventure and safety in building their courses, but they also take care to look after the environment. The company uses Professional Ropes Course Association–accredited builders, who anchor single cables to trees using the Eco-Wrap system, a bolt-free method that doesn't pierce the tree and invite criticism from its grandparents. Using this system, the company can string six ziplines up to 1,000 feet long at heights of up to 80 feet through the aromatic canopies of incense cedars and ponderosa pine trees. Guides take visitors darting down these single-cable paths and across three suspension bridges. Then, they rappel toward the forest floor at one of two rappelling stations. As visitors glide through the forest, they can catch glimpses of wildlife as well as the Fresno Dome and other natural rock formations.