Getty Images I know that curling your hair with socks is a ~thing~ now, but, TBH, the end results are too inconsistent for me. I prefer to use a more tried-and-tested method to achieve perfect heat-less curls: flexi rods. You can use them to curl your hair without risking the heat damage from a curling wand or having to deal with those rigid, more traditional rollers. But here's the thing: Even though flexi rod sets are more likely to give you consistent results, they can be a little hard to install. There's a few very specific steps you need to keep in mind—and if you don't follow 'em ...