When it comes to breathing new life into fine, flat hair there's one woman who we turn to: celebrity hairstylist Jen Atkin and her brand OUAI. Specifically formulated for finer tresses, the Fine Hair conditioner is enriched with biotin, hemp seed extract, chia seed oil and hydrolysed keratin to leave strands nourished and bouncy, without weighing them down. The best parts? It's sulphate free and imbued with the brand's Mercer Street fragrance, think orange, peony, magnolia, jasmine and musk. OUAI conditionerHow to use: Apply to ends, then comb through with fingers. Leave for 3 minutes, then rinse300ml