- Kate Middleton often stands in heels for hours at a time while making public appearances.
- So to ensure comfort, etiquette expert Myka Meier says the Princess of Wales uses two tricks.
Heels can be uncomfortable, but $4 knows how to make them work.
The Princess of Wales, who is frequently on her feet for hours during royal engagements, is said to use at least two tricks to stay both comfortable and fashionably dressed at all times.
Insider previously spoke with etiquette expert $4 the founder of $4, about the specific products the British royal is said to use.
Kate Middleton has been photographed wearing tights with non-slip grips on them
To prevent her feet from slipping out of her heels, Meier said Kate wears $4, a high-end department store in the UK.
The sheer stockings retail for £6, or around $6.38, and feature gel strips on the bottom of each foot that grip to the soles of shoes.
As Footwear News reported in 2017, royal fans previously spotted a photo of Kate seemingly $4while on a royal tour of Canada in July 2011.
The photo shows clear, gel-like strips peeking out over the side of Princess of Wales' pointed-toe Tabitha Simmons heels.
Kate also wore the shoes while visiting Sainte-Justine University Hospital in Montreal on the third day of the trip.
Representatives for John Lewis did not respond to Insider's previous request for comment.
The Princess of Wales is also said to use leather insoles
Previously speaking with Insider, Meier also noted that Kate has been known to wear $4 created by British designer Rachel Bowditch.
According to Alice Bow's website, $4 — which retail for $22.95 in the US — are designed to cushion your feet so you can comfortably wear any type of shoe, including high heels, for hours.
In 2015, an unnamed source told Vanity Fair's royal correspondent Katie Nicholl that Kate had "$4" of the Alice Bow insoles. "She thinks they are great," the source said.
At the time, a spokesperson for Alice Bow told Vanity Fair that the company could not comment on "talk of the duchess wearing [its] insoles."
"We have seen a massive surge in site visits, however," the spokesperson added.
Representatives for Alice Bow did not respond to Insider's previous request for comment.
There's no official protocol that dictates what footwear royals should wear
But according to royal expert $4, the late Queen Elizabeth II set a $4 in public during $4.
"You never see a royal without their nude stockings," Arbiter previously told Insider. "I would say that's really the only hard, steadfast rule in terms of what the Queen requires."
Meier added that British royals typically follow that guideline while "performing their royal duties in their professional roles."
The same goes for their shoes, with royals making sure to choose "appropriate" footwear for the occasion, like Kate wearing "sneakers and flats at more casual or athletic-themed events," Meier said
Lucy Yang contributed to an earlier version of this article.