The Bio Ionic worked well on all of our testers’ hair, but it’s best on drier hair with a medium thickness. We spritzed testers’ hair with some keratin smoothing treatment, but the Bio Ionic did a lot of the heavy lifting to make our hair feel softer. The tool gets hot, but not too hot to grip, and it excels at creating the silky volume you want without making your hair pin-straight and flat. One tester put it perfectly: “[The Bio Ionic] is the Rumplestiltskin of hair straighteners. It’s turning straw into gold.”
Those with fine hair can keep the straightener at a lower temperature, while those with thick hair can increase the temperature to ensure they'll walk away with the same smooth results. No matter your hair type, the floating plate design and the curved edges of the plates themselves prevent any snagging or damage so your hair will glide through smoothly.
Due in large part to the damage we inflicted on our poor locks during this time, we’ve learned that heat protection isn’t just a luxury: it’s mandatory when it comes to hair straightening. That’s why so many hair straighteners now feature conditioners built right into the plates. We also learned that excess heat can cause permanent damage to hair, so now many flat irons come with automatic turn-off features or self-adjusting heat settings. Well, as the saying goes, there is no progress without a bit of struggle and our hair certainly struggled during the early 2000’s!
We started with six flat irons but ultimately dropped two because they didn’t work well on any of our testers’ hair. The inexpensive, but highly rated HSI Professional Glider Ceramic Tourmaline Ionic Flat Iron was bulky and awkward. Testers said it felt like two pieces of plastic passing through their hair. We thought the NuMe Megastar Hair Straightener, a popular and more high-end tool, would be a clear contender for our list. However, testers said it snagged hard against their hair to the point of hurting. It was also difficult to hold closed when styling. Because both of these flat irons received such low ratings among our testers, we didn’t include them in our top picks.
So, when it comes to hair care, it is no surprise that the healing benefits of infrared technology would make their way into the industry sooner or later! The far infrared technology in the CHI Air Expert Classic Tourmaline Ceramic Flat Iron leaves your hair looking and feeling smoother and silkier than ever before, while helping to restore your strands to their naturally strong and beautiful thickness.
Titanium is a lightweight metal that heats up very quickly and can hold high heat at a consistent temperature. This material is ideal for those who have thick, curly, or natural hair that can be more difficult to straighten. Since it's lighter than ceramic, it also makes for a lighter hair straightener overall, which means less arm strain as you're taming your mane. As someone who has very thick hair, I can attest — Any feature that can make styling easier and faster is a plus.

“I wanted a straightener I could use on wet hair, since I’m usually on the go and don’t always have time to dry it. With this Wet 2 Straight Hair straightener, I was able to straighten my hair after it was towel-dried and only had to go over my hair twice for it to be completely dry. Granted, I have semi-thin hair, so it doesn’t take too much to straighten it, but with other straighteners, I would have to go over it about three or four times and couldn’t straighten it when it was wet.”
Italiano: Arricciare i Capelli con il Ferro, Español: rizar el cabello con un rizador, Deutsch: Haar mit einem Lockenstab locken, Português: Fazer Babyliss, Français: boucler ses cheveux avec un fer à friser, Русский: накрутить волосы плойкой, 中文: 用卷发棒卷发, Bahasa Indonesia: Mengeriting Rambut Menggunakan Setrika Pengeriting Rambut, Nederlands: Je haar krullen met een krultang
Not sure which temperature setting is right for your hair? We recommend starting slow and building up to higher heat settings gradually. Not only will you be able to perfectly identify the optimal heat setting for your hair, but you will also avoid overheating. After all, very few of us actually need upwards of 400° F to see the salon results we’ve always wanted!
This BaBylissPRO porcelain ceramic straightening iron is made with porcelain ceramic, which distributes far-infrared heat evenly across the strands. Not only is it gentler and more healthy for your hair, but it can handle wide sections of hair at once because of its long barrel. The shape is rounded and sleek, so it’s ideal for curling, and it won’t catch or knot while you’re curling.

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.”

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