Hair stylist Sam McKnight cut his teeth working on Vogue covers (nearly two hundred of them) and fashion shows for Chanel, Vivienne Westwood, and Balmain. His portfolio of iconic looks includes Princess Diana’s ‘90s cut and Agyness Deyn's bleach blonde crop. Now, the master of modern hair has bottled up his famed styles—including his signature tousled texture—for the masses. “It’s about making [your hair] the best of what you have,” explains McKnight, “I’ve formulated everything to have a light touch, and a firm hold.”