I've had cartridges with me for years and the Mark II version seems solid and well made. They also have elastic straps that keep the tongues in place, which is nice. I bought this pair for my 10 year old and so far they are holding up very well. Update 4/9/19: There are tears in the fabric over the sole. I know kids don't like shoes very much, but they usually last a little better than these. It's ok when the weather is better, but not so good when it's raining.
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