I wore my microspikes all winter and wore them out!! They are a fantastic tool and I keep them between my feet on the floor of the car at all times. The spikes rounded off from abrasion on ice and rocks but I was able to sharpen them in a huge disk sander I have. I bought a new pair from REI because I had a dividend and they had a 20% off sale!! I called the company and suggested making a model with carbide spikes..Evan Clarke