We loved the Bio Ionic’s user-friendly design. Two of our favorite features are its bright digital temperature control and the instructions stamped directly onto the tool. It also feels natural in the hand, and its matte finish provides a slight grippiness, but doesn’t pull at the hair when styling. Plus, the tool sports a uniquely shaped plate that’s curved at the tip and makes it really easy to get close to the scalp. One tester who is new to using flat irons said the Bio Ionic felt intuitive and even encouraged her to try harder styles, like creating curls and waves.

3-in-1 Steam Hair Straightener STRAIGHTENS, FLIPS, CURLS: The upgraded 2018 design of PureBlackMagic Flat Iron Styler by TRENDY PRO will not only infuse your hair with Argan Oil or Water Steam for long lasting frizz-free silky hair but will also be there for you whether you are in a mood for straight, curly or flip-up hair style. This baby has enough power to turn the frizziest coarsest hair to silky and soft in a single pass - call it Pure Black Magic, IT WORKS!


“I’ve owned a Conair, Chi, and I-Tech straighter before, but this one is FABULOUS! There really is no tugging at all on your hair — so smooth, and I was shocked that it truly heats up in 15 seconds, as advertised! It also does something magical to my hair: It adds more shine like no flat iron has done before. Mind you, my hair is very difficult to deal with. It has always been coarse, wavy, dry, and thick! This iron worked beautifully on my hair.”
This styling iron has 1-inch plates, allowing it to do more than just straighten. It can also curl, flip, and be used to add volume if your hair tends to fall flat. It heats up in under 30 seconds so you can start styling almost right away, and there are a wide range of temperature settings from 250 degrees to 460 degrees Fahrenheit. While the high-temperature options make this straightener ideal for other hair types, too, if you do have fine hair you'll want to keep this in the lower temperature range.
“I’ve owned a Conair, Chi, and I-Tech straighter before, but this one is FABULOUS! There really is no tugging at all on your hair — so smooth, and I was shocked that it truly heats up in 15 seconds, as advertised! It also does something magical to my hair: It adds more shine like no flat iron has done before. Mind you, my hair is very difficult to deal with. It has always been coarse, wavy, dry, and thick! This iron worked beautifully on my hair.”
Consider this the perfect flat iron for full hair. "It is great for thicker textures because it distributes heat evenly, allowing for less passes through the hair," explains stylist Lacy Redway. The plates "make it easier to straighten or curl longer hair lengths." Redway was responsible for  Tessa Thompson’s sleek ‘do on her past ELLE cover, so you know it’s top-notch.

Automatic shutoff isn’t a feature we included in our criteria since people have varying opinions about it, but we liked that the Chi Elite has this. Especially for new users who might forget to turn off their flat irons. Like the Chi Air, the Chi Elite will shut off after one hour. However, if you’re working with kinky hair, auto shutoff may be a problem. Traditionally this hair type will take longer to straighten due to detangling and the fragility of the hair.
Bio Ionic 10X Pro Styling Iron 1" - Nano Ionic - with Vibrating Plates The Bio Ionic 10X Pro Styling Iron 1 Inch is part of the Luxe Pro Styling Collection. Natural Volcanic Rock Minerals infused into the Bio Ionic Luxe Pro Styling Collection are uniquely refined to emit negative ions that drive tiny water molecules deep into the hair. Hair becomes hydrated and conditioned on the inside, while the outer cuticle layer lies flat and smooth, trapping moisture, giving it a vibrant shine.
Negative ions have been a longtime fan favorite in the hair care industry, and it is no surprise that this same technology would appear in our top picks for the best hair straightener. Negative ions have been found to reduce static and frizz while locking in moisture, and the same goes for your hair when you use the CHI Air Expert Classic Tourmaline Ceramic Flat Iron!
Size matters. With plates too big or too small, you’ll have to make multiple passes. This exposes your hair to high heat longer and increases the risk that you’ll do damage. According to Janine Jarman, owner and operator of acclaimed Hollywood salon Hairroin, a 1-inch-wide plate will do for most people, and if you want to use your iron for anything other than straightening, like creating curls or waves, you’ll need a 1-inch plate; anything larger won’t make the waves or curls tight enough. She also pointed out length is important too. “You need plates to be at least 3 inches long, or close to it, so you’re not spending a ton of time with small sections.”
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.
The glider plus is designed to protect your hair with integrated heat balance micro processors that continuously monitor the exact temperature across the surface of the plates and automatically adjust the temperature for evenly distributed heat. That means fewer passes are needed for silky results, while protecting your precious hair from over heat exposure.
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