After many kilometers of running, I noticed that a couple of elements on my right shoe showed abrasion. What is the reason for this?

Intensive tests have shown that the abrasion on elements is directly related to running style. The wearing down of certain elements is an indication of joints and muscles that the runner is favoring.

Without realizing it, I noticed that I had been running with a defective element.
Is that O.K.?

There are different reasons for broken elements such as sharp stones or broken glass .When this occurs, the other elements in the system take over. Pay attention to your running feeling and you will know when it is time to replace your shoes.

What is the clicking noise that I hear when I run?

The noise you hear is normal. It is caused by micro grooves inside the elements that interlock for better push-off. This does not occur with every runner, and depends on running style.