How to Style a Shag Haircut to Perfection Every Single Time

When it's time for finishing touches, Toth recommends you take a styling clay or texturizing wax like the Oribe Flash Form Finishing Spray Wax ($42) to add definition and detail the ends.

The only real no-no? "Avoid applying products with a high water content onto already styled hair, as this will revert the hair to the natural wave form — unless it's pin-straight naturally — and result in a less edgy look," Forecast says. After all, the shag is all about that back-from-the-'70s edge.