10 best flat irons, according to celebrity hairstylists

Flat irons also may be the secret to frizz-free, sleek straight, and glossy hair due to ionization. According to Stefan Bertin, a London-based hairstylist, the process helps close the hair cuticle, giving it a sheen. However, he noted that "there's no real substance, scientific evidence of that, but I feel like there is a difference."

Flat irons are readily available at a variety of Shopping reader favorite retailers, ranging from Walmart and Amazon to Sephora and Target. They’re also available at Best Buy, Ulta, Dermstore and Bed Bath & Beyond. Hair straighteners, like the 1-inch Remington iron, can cost as little as $18 at Amazon, while a top-of-the-line model like the Dyson Corrale can cost nearly $500. Popular flat iron brands range from Conair and Rusk to Sedu and NuMe.

We spoke with seven celebrity hairstylists who work with everyone from Reese Witherspoon to Octavia Spencer to find out everything you need to know before buying a flat iron this year.