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If you walk miles and miles every week you're just gonna need a new pair of shoes once or twice a year. I've resigned myself to it at this point.
You mean you want your shoes to last you a lifetime?
If you walk considerable distances daily you should replace your shoes AT LEAST every 3 months. Actually, you should have at least two pairs and use them interchangeably to give the amortization foam time to spring back up after use. Of course, if you're willing to pay a lot for a really good pair like the Brooks
Stirchley is talking about, they'll last you longer, but even pro running shoes like that lose their amortization after some time. Wear and tear is just inevitable. Incidentally, walking a lot is not that different from running and presents a considerable shock for your heels and knees, so walking every day requires a pair of running shoes, not walking shoes. Walking shoes are only good for walking around the office or something.
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Look, I'm not judging you - after all, I'm posting here myself, but maybe, just maybe, if you spent less time here and more time watching films, maybe, and I stress, maybe your taste would be of some value. Just a thought, ya know.