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Even pairs that see only occasional use can get worn out if they’re just tossed in a closet.

The lightweight, airy material that makes a great running shoe could get damaged.

shoes dangling by the laces

Wood also advises proper untying when you remove shoes.

This bad habit can lead to shoes with damaged heel cups.

But shoes are meant to be worn.

top view of worn-out canvas sneakers

So what signs indicate it’s time to say good-bye?

Sneakers should be used for running on average about 300-500 miles, according toRunner’s World.

To determine if your shoes need replacing, put your shoes on an eye-level, flat surface.

display of boots sneakers and heels

Podiatrist Dr. Jackie Sutera calls this the “tabletop test.”

Dr. Velimir Petkov, a podiatrist withPremier Podiatry, also suggests looking at the midsole, or cushioning part.

Shoes thathurt your feetare a red flag that it’s time for an upgrade.

Maybe the shoe is fine, but your foot changed.

For pairs that you’ve had a long time, verify they still fit.

Avoid the damage of wearingtoo-small shoes.

While you’re investigating, check your shoes for anyfunky smells.

If the odor can’t be banished, say goodbye to the shoes (and the bacteria).

Some brands offer a repair program that can restore your shoes to their former glory, likeChacosandals' Rechaco.

All kinds of parts, from straps and buckles to soles can be replaced.

Prices start at $10 and increase from there, depending on the extent of the repairs.

Many manufacturers also offer their own recycling programs.Kamikrain boots made in North America are completely recyclable.

Used pairs can be sent via a pre-paid shipping label.

Teva offers a similar free-recycling program for their sandals, called TevaForever.

For athletic shoes,Nikewill accept any brand.

For leather goods, consider upcycling.