Olaplex No.7 Bonding Oil ($21, originally $30)
This hair oil pulls double duty as a heat protectant and a treatment. It shields hair up to 450 degrees while boosting shine, color vibrancy, and softness, and it helps tame frizz and flyaways. Most notably, despite being an oil, many users — including a PS editor — say it feels weightless and doesn't drag down her layers the way some formulas do. Find out more about what makes it so highly coveted in our Olaplex No.7 Bonding Oil review.
Editor Quote: "After I apply this oil, my hair immediately absorbs it. I can layer on as much as I need to without worrying about it weighing down my layers. I love that I can add it to my hair when it's damp for heat protection and then work it through the ends and the layers around my face once it's dry. The buildable formula is easy to use without worrying about overdoing it, so I usually apply a little every day in between washes. I'm still surprised by how soft my curls feel after applying it." — Angela Elias, contributing shopping editor
