Lived-in, undone and effortless—these are words we hear all the time at New York Fashion Week (and in the salon!), so it’s important to add new wave techniques to the arsenal. From top stylists backstage at the industry’s hottest shows, here are quickies for cheating four types of waves!

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1. The Secret To S-Waves

For undone, cool-girl waves, try the S-Wave technique. Use a flat iron and softly bend the hair in an “S” shape. The secret is to keep the iron really hot and to be constantly…