Shoes and metrics

The best metric to measure the age of a pair of shoes is the distance walked in them

My latest pair of “belt chappli” (sandals with a belt going around the heels) is only ten months old, but has started wearing. Walking long distances in the said sandals has become a pain. The top is nice, the sole is fantastic, but the inner sole has gotten FUBARed. Maybe it was a stone that got stuck under my feet which I didn’t notice. Maybe it was several such small stones. But with the inner sole “gone”, time is nigh to possibly retire the chappal.

But then a good pair of sandals is supposed to last much longer (and I did 2 longish foreign trips in this period where this chappal didn’t travel with me). Historically, good sandals have lasted two years or more. And it is not that this one is cheap. I paid close to Rs. 2000 for it, and it’s branded, too (Lee Cooper), and I had found it after a lot o difficulty (three months of searching). That it has lasted less than a year is not fair.

But then the question arises as to whether I have the right metrics in place. The number of months or years that a pair of shoes lasts is an intuitive metric of its quality, but it is not the right one. For, a pair of shoes doesn’t wear when it is not worn! Of course there might be mild wear and tear due to weather conditions, but for a pair of shoes made of good leather, that can be ignored.

So maybe the best metric for a pair of shoes is the amount of time it is worn? Then again, while a shoe might wear while its worn, it doesn’t wear too much when it’s at rest –  I mean its shape changes to fit the wearer’s foot (over the medium term) and that might cause some wear and tear, but in the long run, there is unlikely to be much wear and tear at rest.

From that perspective, I hereby declare that the best metric to measure a shoe’s performance is the number of kilometres walked or run in it (latter causes significantly more wear and tear, but let’s assume that walking shoes and running shoes are mutually exclusive (which they’re not) ). This is an excellent because it takes care of a number of features that correlate with the wear and tear, and is not hard to fathom.

Going by this metric, my current pair of “belt chappli” has put in considerable service. Over the last ten months, the frequency of going on “beats” in Jayanagar has gone up, and the distance covered in each beat, too. Having pretty much stopped driving, I walk more than I used to, and this is my default shoe for such perambulations.

The problem now is the search cost – good belt chapplis that fit my feet are hard to find. It’s a liquidity problem, I think (:P). Maybe I should just consider getting the inner sole replaced and get on with this one.

One thought on “Shoes and metrics”

  1. The runners discovered this long ago. Right time to replace a running shoe is not specified in time, but in miles run. Usual rule of thumb is to replace every 500 miles, earlier if you run mostly on trails, later if you run mostly on treadmills.

    Should be interesting to derive similar figure for walking shoes and slippers.

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