shoes_worn_out_upper_small Actually, there could be many reasons for old running shoes to get retired. Here, we'll start from the most obvious and visible one. The first sign is pretty physical. Damages of upper part might cause getting road debris inside, sliding the foot, uneven friction, which can result to blisters or even injuries.

Here's an example. The shoes are more than one year old, they have quite a bunch of speed sessions and eight races behind, including three marathons. So it's not surprising that the mesh degraded to the extent that minor damages are increasingly accumulated. Eventually, the material is simply getting ripped. If the upper mesh indicates wear and tire in such a clear way, it's definitely proper time to look for a replacement.

shoes_worn_out_upper_preview

As far as it's a big topic of a significant interest, we'll continue covering this in the next blog posts.