While other self-made billionaires might thinking nothing of wearing a new pair of expensive designer shoes every week, New York City Mayor Michael Bloomberg would simply consider that a giant waste of cash.

The frugal financier has worn only two pairs of work shoes over the past 10 years. "One day he'll wear one, the next the other — and when they get worn down, he has them resoled," said Bloomberg's spokesman Stu Loeser to the NY Post.

"He could buy any shoes he wanted, but he likes these," he added. "They are comfortable, and they work, so he says there's no need for a new pair."

While evidence of what type of footwear brand Bloomberg prefers has long since worn away, one shoe expert said that one of the pairs appears to be a $328 "Dennehy" penny-loafer.

"A pair of shoes like that could go 18 to 20 years if you put cream on them, shine them up, resole them every eight to nine months, and depending on how much you perspire, use cedar trees on the inside," he told The Post

Of course, you don't have to spend hundreds of dollars on shoes to walk in Bloomberg's sustainable tracks. Simple maintenance — and occasional resoling can add many years to your favorite footwear. One company, Resole America, will even shine up, restitch, and resole your shoes within a matter of weeks. All you have to do is send in your pair — and voila! — new shoes.

Check out their website here — and well done to Bloomberg for doing his part to reduce waste and set an example, one step at a time.

Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

NYC Mayor Bloomberg's sustainable footwear
Billionaire businessman has worn only two pairs of work shoes for the past 10 years.