After trying a pair of imitation tevas on the trail, I realized I liked the feeling of hiking in sandals but wanted a sturdier pair for walking on well groomed trails and all the above. I bought the z/1's just before a backpacking trip to Yosemite and broke in the footbed and straps for a week. For four days on the trail in Yosemite, from dirt trails to mud trails, boulder fields to ascending peaks, I wore my sandals full time except one afternoon when the freezing rain forced me to wear my boots. The terreno sole has excellent traction on rock, trusting it while descending steep rock faces with a heavy pack. The straps were comfortable, keeping my feet in place. Never rolled my ankle. These sandals will last me a long time.