I've Studied Sienna Miller's Effortlessly Tousled Hair—These Are the 9 Products I Know She Uses

First things first, how does Sienna achieve that soft, loose wave? "Sienna has great hair. It’s quite thick naturally with a slight natural wave. I love to enhance what she has, giving her hair some definition and love," says hairstylist and founder of his eponymous hair line, Sam McKnight. "I often use a mix of a couple of tools, including a BaByliss Pro Medium Curling Tong 25mm and a hair straightener for the front sections," he says.

"For the curling tong, I mist each section with Modern Hairspray, then twist down the barrel of the tong," says McKnight. "I alternate the direction of each section, so the waves are more natural and go in different directions, also keeping sections small so it has more depth and texture," he says. "It’s keeps it from becoming too glamourous."

"For the front sections, I either wave them away from her face or often use straighteners to create an 'S' shape with her hair and gently tap with the straighteners to heat and create an effortless face framing wave," says McKnight. We like GHD hair straighteners which are perfect for creating 'S' waves.

Sienna's hair never looks too done, so McKnight advises against creating tighter curls and opting for a looser wave instead. "Don’t overwork it or create too strong a wave. It should feel and look effortlessly cool," says McKnight. One of his hero products is how he gets that cool-girl texture in Sienna's lengths. "If you have finer hair or hair that drops quickly, my Cool Girl Texture Mist should be your go-to. It gives instant volume and texture that lasts in seconds."

Luke Hersheson, hairstylist & CEO of Hershesons, created these effortless waves for Sienna Miller at the Venice Film Festival. “I worked some of our Zhoosh Foam through the hair to give it hold, then blow dried it in," says Hersheson.

“After that, I used the large barrel wand attachment on The Multi-Tasker, which is a nice, big, chunky tong that forms a really soft bend in the hair," says Hersheson. "Instead of tighter 'spaniel' waves, you get a softer, more relaxed finish that looks really natural." The multiple attachments are so ideal for creating a whole range of hair looks.

To create that piecey texture, Hersheson applied this multi-purpose cream through her mid-lengths. “To finish, I used some Almost Everything Cream through the mid-lengths and ends, and separated the tonged pieces so the look felt quite ethereal and lived-in," he says. "When the wind hit her hair, it moved nicely.”

"Sienna’s hair loves some moisture, so I always use my Happy Endings Nourishing Balm through her Iengths," says McKnight. "It gives polish and instant hydration, just what we need for effortless definition, and to de-frizz and de-fluff."

"For a high-shine glossy finish I will add a few drops of my Love Me Do Nourishing Oil as a finishing touch," says McKnight.