Round three of our new feature: Things We Finish, in which we talk about the products we squeeze, scrape, or shake 'til there's nothing left. Today we hear from our managing editor, Elizabeth, on the hair product that she can’t live without.

You know that first scene of Legally Blonde, where “Perfect Day” is playing cheerfully over the opening credits and Elle Wood’s long, luscious, bodied, smooth hair shakes across the screen? I want that. I want the Marcia Brady, 100 brushes per side, hair commercial, “all-American” locks of silk. I have tried many a product to achieve this look—I’ve done the double-up, the triple threat, the still-wet application, the already-dried-and-styled run-through; I’ve done the gels, the mousses, the serums, the oils, and while some may have been good, none of them have taken up permanent residence in my apartment except Bumble and bumble’s Hairdresser’s Invisible Oil.

In the (almost) two years since it’s been introduced, I don’t think I’ve gone a day without it in my hair. I have a bottle in my medicine cabinet, I have a bottle under my sink, I have a bottle in my shower, I have one in my dopp kit, and there have been quite a few that have made their way into the recycling bin once I’ve drained them of all of their power. The oil is thick enough to weigh down any flyaways that cause photo-phobia, and thin enough to avoid flat-hair syndrome. For anyone whose hair does not agree with humidity, women who never venture near shampoo promising extra volume, or girls who have dabbled with bleach and have the brittle ends to prove it, try this wunderkind of an oil. I find it works the best applied while still standing in the shower; I smooth four or five pumps through my sopping hair while ringing out the excess water. The oil seeps in while I air dry, and leaves me with shiny, slightly beach-scented, smooth-to-the-touch, silk-to-the-eyes, Reese-Witherspoon-level hair.

—Elizabeth Brockway

Photos by Elizabeth Brockway.