Testei com mutimetro e posso atestar que é o fone que parou de funcionar mesmo. These handle this track PERFECTLY. We are very happy with the purchase. All in all I am so happy with this purchase. They worked great. She loved them, they fit well, and Unfortunately I was surprised that they lasted about a month before the top portion started breaking beyond repair. This shoes fit great, no tough spots to break in. I really wanted them to work. Great for organizing. They do get slippery if they get too wet.