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Secret weapon: A water-based flexible-hold hair spray. Our go-to: Garnier Fructis Style Anti-Humidity Flexible Control Hairspray ($5, drugstores). "Straight hair needs a lightweight product so it doesn't look greasy or flat by the end of the day," says celebrity hairstylist Sarah Potempa. Look for water as the first ingredient and "soft" or "flexible" on the label.
Pro trick: Mist the spray directly onto a brush with nylon and boar bristles, like Sarah Potempa On Set Styling Brush ($42, sarahpotempa.com), and run it through dry hair to smooth frizz and flyaways. This will distribute the product evenly without giving your hair a crunchy feel.
Ace the application
Fine hair: Spritz once onto the brush.
Medium hair: Spritz two or three times, brushing through in between.
Thick hair: Spritz four or six times, brushing through in between.