If the shoe fits, walk in it everywhere you go.

Taylor Swifts record-breaking Eras Tour has run for close to two years and seen the pop star travel around the world, with the shows concluding in Vancouver, Canada on Dec. 8.

Swift, 34, wears a multitude of costumes  and at least nine different pairs of shoes  over the course of each three-plus-hour show, which spans her entire 11-album career and revisits each of her eras distinct aesthetics.

And as Swifties know well, rain, wind and extreme heat are no match for the performer; in almost every instance, the show will go on.

So how does she dance, sing, jump, and run around the stage comfortably in high heels the entire time? Besides a rigorous workout routine tailored to her specific needs, one secret lies in the soles of her shoes, crafted by legendary designer Christian Louboutin.

The French footwear artist spoke to InStyle about exactly how he crafted her many custom heels  including knee-high boots, booties, loafers, lace-up booties and strappy pumps  to withstand her demanding performances. (And those of the Grammy winners dancers, who wear their own Loubs.)

Louboutin, who has designed many shoes for Taylor over the years, revealed that he altered his signature red bottoms to include a rubber sole, making them unslippable.

Weather is unpredictable, he told the outlet. However, each pair is crafted with a signature red rubber sole, which makes it easy to dance. We typically incorporate this feature for musicians tours to withstand the performances night after night.

Plus, Louboutin says, Each pair is made to fully to allow for quick changes through the entirety of the show. As they are dancing for over three hours, comfort is also extremely important. So we incorporated [a] sturdy block heel and also flats.

As for what inspired Swifts stage shoes? Her past, of course, as well as his own roots.