Great shoes I average about 2-3 years of daily wear before the netting that covers your foot to keep stuff out (hence kso) starts to rip and come apart. At which I swap them out for a new pair. Easily the most durable & comfortable shoes ever made. I actually set my foot on top of a motorcycle muffler/exhaust and didn't realize it because I didn't feel the heat & it didn't damage the shoe but when we stopped at a light the guy next to me pointed it out to me.