This product is the secret behind Alexa Chung and Sienna Miller's effortlessly stylish, tousled hair.

      Despite having a multitude of hair tools at my disposal, such as hot brushes and curling wands as a beauty editor, I actually dislike my hair appearing overly "styled." While I do enjoy a voluminous blow-dry for special occasions, day-to-day I prefer my hair to look effortless and tousled, as if I've just rolled out of bed with perfectly messy, loose waves. Therefore, it’s no surprise that I look up to hair icons like Sienna Miller, Alexa Chung, and Kate Moss for their flawlessly undone hairstyles and piece-y waves. Although their hair is skillfully styled by top hair professionals, they all share a fondness for one particular texturizing spray.

      **Hair by Sam McKnight Cool Girl Spray**

      **Pros:** Adds volume, texture, and lasting hold; ideal for fine hair; has a delightful scent; favored by celebrities.

      **Cons:** Pricier than most texturizing sprays, but it's worth it.

      The Cool Girl Barely There Texture Mist is precisely what its name suggests. Developed by renowned hairstylist Sam McKnight MBE, who has styled everyone from Princess Diana to Kate Moss and Sienna Miller, this mist infuses just the right amount of grit into your hair, enhancing volume and texture—even in fine hair. Inspired by the effortlessly chic looks he's crafted on Kate Moss, McKnight designed this product to help us achieve similar undone styles at home. In the video above, McKnight applies it to Sienna Miller’s hair, flipping her locks upside down and misting it for effortlessly textured lengths. Alexa Chung is also a fan, previously referring to it as “a gig in a can,” perfect for her signature messy waves. It truly captures that cool-girl aesthetic in a bottle.

      I have personally used this product for years and can vouch for its effectiveness. When my curls or waves appear too polished, I like to spritz some of it through my lengths and use my fingers to create a tousled effect. It helps maintain an undone look while enhancing texture and providing lift at the roots when applied around the crown. Plus, it’s among the best-smelling hair products I’ve ever tried, and I've received compliments just for its fragrance. Although it's not technically a hairspray, it does offer a lightweight hold and brushes out easily by the end of the day—no crunchiness involved. Honestly, if you invest in just one hair product, let it be this one. It also comes in a convenient travel-size bottle, perfect for on-the-go touch-ups. Thank you, McKnight, for your brilliance.

      **Shop Now:**

      Hair by Sam McKnight

      Cool Girl Barely There Texture Mist

      **Why Trust Us:**

      At Who What Wear UK, we understand that beauty isn’t one-size-fits-all. Our editors have reviewed thousands of products, including skincare, makeup, hair, and nails, collaborating closely with trusted experts—dermatologists, makeup artists, and industry leaders—to ensure that every guide is thoroughly researched, inclusive, and relevant for you. We prioritize formulas that perform, whether they are affordable favorites or luxury options. Our product choices are based on tangible results, ingredient knowledge, and genuine recommendations we’d share with friends.