We tried biomechanics for the first time at 4 years old! Unacceptable, they ended up like this in less than a month! The front wore out and the child did absolutely nothing. I don't let him stay with others; I'm always with him. He doesn't even play ball, so I can't say that was the cause, nor did he drag them anywhere. They started wearing out after 20 days and as the days pass, even more. Unacceptable product! I will never buy biomechanics again. They are also more expensive than the others. Also, they slip a lot, and on dry tile—I’m not even talking about wet. The child fell many times because of slipping, whereas with other shoes this had never happened on the same tiles, e.g. apartment building entrance, supermarket, etc. From me, a huge NO.