Since the days of daring 1920s flappers, the bob has been a power look. Now it’s back on-trend—and more modern than ever. To achieve the perfect tousled bob, you’ll need to devote equal attention to your haircare—choosing the right shampoo and conditioner— and styling. ELLE Insider and beauty vlogger Jillian Lansky of The August Diaries shows us how it’s done.