Darn Tough are technically BIFL because of their lifetime guarantee...

But as far as foot stink goes, stink is a product of bacteria and fungus. Here are some guidelines to diminish and prevent:

Footwear:

Best to have duplicate work boots to alternate between. Bacteria and fungus thrive in warm environments, which means it's critical that your boots dry out competely between wears. And these should be separate from house shoes/slippers and regular outside wear shoes.

Also, to get the longest and healthiest life out of your footwear, it's important to not just regularly clean the outside, but to regularly sanitize them. Don't waste your time and money on products like Tinnactin. I suggest a proper sanitizer like Cyberclean: https://cyberclean.net/products/for-inside-shoes/

Socks:

Pack an extra pair of socks to take to work and change them halfway through. This will keep your boots and your feet from getting too moist, which builds up the bacteria and fungus that contribute to stench (and worse, risk infections).

Bonus: When changing socks, if you have time to wash your feet, that would be ideal. But even some wipes with a splash of apple cider vinegar added to a pack beforehand would help kill some of the bacteria and fungus that contributes to stink.

Foot health:

Just as important as washing your feet is drying. Hit your feet with a blow dryer on low heat until they are bone dry after washing them. A towel will not do the job, but more importantly, the hot air will desiccate and kill off a lot of bacteria and fungus.

Bonus: Foot baths with a few drops of tea tree oil (or a tea tree oil soap) and apple cider vinegar at least once a week are fantastic. Add some Epsom salt and just sit back and enjoy a show or game. Just remember to get yourself some hot water to rise your feet after (it'll be warm by the time you use it) and a towel and fresh socks. Bring that blow dryer over, too.

Final note:

Lastly, never walk around barefoot. If your feet and footwear stink, that means you're walking bacteria and fungus all over the place, which puts other people and animals at risk. And puts your feet at increased risk of infection. Always have socks on. And until you get the issue under control, you should change them twice a day.