Unfortunately the negative reviews are true, NB 623/624 has been worn for over a decade. This shoe was designed for the non-human foot. Not sure what they used for the model, but they might want to throw it away and use the human model. The heel area is at least 3/4" to 1" shorter than previous versions. It seems that this shoe slips off the heel with every step as it is not high enough. A picture is worth a thousand words. Old shoes for new ones.
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