Jessica Chastain

Photo: Getty Images/George Pimentel

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If you want loose curls...

The tool for you: Curling iron or wand, 1-to-1 1/4-inch barrel.

Why: Whichever tool you prefer (iron or wand), the important thing is making sure it has a large barrel to get a softer, more voluminous wave, Chastain says.

How to get the look: Curl the hair in 2-inch sections (wider than you would use for bouncy curls), since you want the curls to be less structured. Use alternating angles to make the curls look more natural and less done. Then, follow up with a flat brush, brushing through the ends for softness and polish, Chastain says.