See: the Olsen dip.

Now, the Olsens laidback hair color is also seeing a revival.

What is the Olsen dip?

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Ashley Olsen and Mary-Kate Olsen during 7th Annual Free Arts NYC Art + Photography Benefit Auction at Phillips de Pury & Company in New York, New York, United States. (Photo by Mychal Watts/WireImage)

The same goes for their hair.

Neither the color nor the styling looked overpolished.

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Ashley Olsen and Mary Kate Olsen during Olympus Fashion Week Spring 2005  Marc Jacobs  Front Row at Pier 54 in New York…

Gregory Pace

Why wear the Olsen dip?

How to wear the Olsen dip?

Here are some of our favorite ways to wear it…

This article originally appeared inGlamourUK.