At $230, the Bio Ionic is pricier than any of our top picks. But you get what you pay for. You can truly do with your hair whatever you desire — straight or curled — in one pass. And, if you’re worried about it breaking a few years after purchase, the Bio Ionic comes with a five-year warranty. By investing in a better-quality tool up front, you won’t have to replace your flat iron every couple of years. Plus, the Bio Ionic goes on sale every now and then, so it’s worth keeping your eye out for deals.
FHI’s rounded edge allows you to easily curl or add waves without much effort. It’s almost as small as a travel flat iron, and I love that it straightens even the poofiest sections with just a single pass. But don’t just take my word for it, listen to Beyoncé (via InStyle): “I’m crazy about it! I can’t live without my flatiron! It takes me about an hour to do my hair, and the only time I don’t is when I’m on vacation.”

In addition to a fast heat-up time and multiple temperature settings, the 9-foot cord and 360 swivel make for easier styling and prevents and tangling. You can also travel with this styling iron thanks to the dual voltage settings. Anti-slip edges and floating plates allow your hair to glide effortlessly between the plates, with no pulling or snagging which can be especially damaging for fine hair.

EDITOR’S CHOICE: As the only hair straightener we reviewed featuring Keratin-infused ceramic plates, the LumaBella Keratin Duel Touch Hair Straightener is our top choice for the healthy, shiny hair you’ve always dreamed wanted! With a unique, floating plate design and smart heat sensor, this hair straightener is ideal for a variety of hair types and reduces breakage and splitting by up to 50%.
By-and-large, most people with natural hair have some variation of type 3 or type 4 – which is exactly why low-end hair straighteners can be so dangerous. More curly natural black hair has a tendency to be more porous than other hair types. As a result, it can lose moisture easily and become damaged. With the wrong flat iron, this can lead to split ends and breakage after just a single use.
If you’ve ever used a CHI hair straightener before, then you’re probably pretty well acquainted with the turn dial temperature control of models’ past. While this dial design made it easy to switch on your hair straightener each morning (even before you have had your morning coffee!), it also made it all too easy to accidentally change the temperature during use.
With well over 25,000 reviews, the HSI Professional Ceramic Tourmaline Ionic Flat Iron is one of the best straightening irons you can get, but because of its thin build and rounded plates, you can also use it to curl your hair. It’s got solid ceramic plates to reduce damage, evenly heat hair, and promote shine, and if you’re a traveler, it’s got a dual voltage that can be used anywhere in the world.
If you travel abroad often, you won't have to worry about ruining your investment, either, because the GHD Gold has universal voltage. It also features a generously long 9-foot cord with 360-degree rotation to prevent tangling. The automatic sleep mode shuts off the straightener if it hasn't been used in 30 minutes, so you'll have peace of mind if you forget to shut it off in your morning rush out the door. If something does go wrong, the GHD Gold comes with a 2-year manufacturer's warranty.
“This is a badass flat iron. Here’s the skinny: The moment you turn it on, it has a ‘Fragile, Damaged, Healthy’ setting, and it also auto-locks the buttons to keep what temperature you want while doing your hair. It comes with a professional bag for traveling with it. This flat iron is ‘pinky in the air while drinking your tea’ fancy. It is the Ferrari of flat irons, for a girl on a budget wanting a new flat iron. And for my fellow sistas: It works amazingly on African-American hair.”
If you're still not convinced, then ask yourself a question. Ask yourself how serious you are about your lifting. Decide for yourself, right here and right now, whether you're the kind of lifter GRAY HAIR AND BLACK IRON was written for. If you're not, that's fine. No hard feelings. I said at the beginning that GRAY HAIR AND BLACK IRON was written for a very small, very elite group of men and women. It's not mass-market stuff, and it's not for everyone. It's for deeply committed, deeply serious Iron Warriors - warriors who've been battling the iron for a very long time - and who intend to keep on fighting the fight for many years to come. So if that's NOT who you are, don't order the book.
Straighteners work because they have flat plates that get hot and touch together on either side of your hair. By doing that, they put heat through your hair follicles, trap in moisture and take out frizz. The plates on a flat iron can be made of several different materials, and they’re good for different uses. The best iron for you varies depending on the type of hair you have, the type of styling you want to do, and the amount of heat your hair needs.
At $230, the Bio Ionic is pricier than any of our top picks. But you get what you pay for. You can truly do with your hair whatever you desire — straight or curled — in one pass. And, if you’re worried about it breaking a few years after purchase, the Bio Ionic comes with a five-year warranty. By investing in a better-quality tool up front, you won’t have to replace your flat iron every couple of years. Plus, the Bio Ionic goes on sale every now and then, so it’s worth keeping your eye out for deals.
Once you get over the sticker shock, you'll see just how revolutionary this tool is. It's not a traditional flat iron by any means, but one of the attachments called the "firm smoothing brush" can be used to straighten and smooth frizz in coarse, thick hair. Best part? It works on damp hair, so you're cutting down on the time it takes to get ready as well.

GHD’s “styler” is permanently set to 365 degrees Fahrenheit, which the company says is the highest temperature hair can tolerate before it becomes damaged. As a person who went from a dark brunette to blonde highlights, I can vouch for its straightening power on processed hair. And though I don’t typically think of “comfort” as a flat iron necessity, the springy hinge that connects the two plates really did make it easier to clamp and glide the tool down my hair with minimal effort.

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