How do I know when it’s time to re­place the in­soles in my run­ning shoes?

Runner's World South Africa - - Personal Best -

A few fac­tors de­ter­mine when it’s time to re­place: level of ac­tiv­ity, brand and ma­te­rial, run­ner weight, and in­sole wear pat­tern. The most im­por­tant fac­tor is ac­tiv­ity level (mileage). High­mileage run­ners (more than 40km per week) need to change in­soles ev­ery three to six months. Lower-mileage run­ners should change in­soles ev­ery six to 12 months. I rec­om­mend look­ing for dam­age, crack­ing, tear­ing, and flat­ten­ing of the in­sole to de­ter­mine when to switch. – Bryon G.P. Butts, owner of Per­for­mance Foot­care

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