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How, exactly, do the twins get their beach-meets-city waves?

We had to ask.

Mary-Kate and Ashley Olsen with long, wavy, blonde hair

Gary Gershoff / Getty Images

Forget any notion you have of the Olsens using curling irons or fancy texture spray.

The secret to Ashleys healthy locks?

I wash my hair every other day and never blow-dry it, she told us.

Mary-Kate and Ashley Olsen posing at the Elle Style Awards

Gareth Cattermole / Getty Images

I go out with wet hair and just let itdry naturally.

I love that Ashley has embraced her natural texture, he says.

As it turns out, air-dried hair is the foundation of the twins signature waves.

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I rarely ever pick up a blow-dryer, Townsend confirms.

Instead, he reaches for Rsession Tools Nalu Waver.

Once Ashley and Mary-Kate have waves in their hair, its time to add texture.

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DoveDry Shampoo, used like a texture spray, not a traditional dry cleanser.

It gives their hair the best texture, he says.

Plus, it delivers a matte finish.

Mary-Kate and Ashley wearing big, black sunglasses

Joe Kohen / WireImage / Getty Images

Townsend suggests spraying the formula in small sections from root to tip until you reach your desired texture.

The Olsens are well aware of the obsession over their locks.

Their thoughts on the subject?

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For us, its all about what makes us feel good.

We dont really overdo it, and maybe thats where it stems from.

The finishing touch to the Olsens signature waves?

Mary-Kate and Ashley Olsen

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Ashleys been growing her hair out for a few years now, Townsend says.

I recently chopped off all my hair because it wassodead, Mary-Kate told us.

Im still trying to get used to it.

Mary-Kate and Ashley Olsen

Gary Gershoff / WireImage / Getty Images

Getting accustomed to her shorter do means trying new styles.Her new go-tois slicked back and sleek.

Theyre always the first to try things, Townsend told us.

Were seeing theslicked-back lookall over the runway.

Rock Hard Gel

To get Mary-Kates new sleek look, Townsend reaches for gel.

Ill do the opposite of what I normally do, he says.

Its meant to look wet, meant to look greasy.

Mary-Kate and Ashley Olsen natural waves

Taylor Hill / FilmMagic / Getty Images

Once its dry, he blasts the ends with Doves dry shampoo.

On a day off, Mary-Kate keeps the sleek look going.

For the most part, Ive just been wearinga good old ponytail, she says.

Mary-Kate and Ashley Olsen

Getty Images

The best beauty advice the twins ever received?

Our dad always told us to wear our hair off of our faces, Ashley says.

I always thought that was pretty good advice.