This ‘One Pass’ Straightener Gave Me the Glossiest Hair of My Life

Ask anyone who straightens their hair and they’ll tell you that the unicorn of tools is the “one pass” flat iron. After 15 years of regular straightening without stumbling upon one, I too thought it was the stuff of hair legend—but then I got my hands on the Bio Ionic OnePass Styling Iron. 

First, let me be clear: I don’t mean the “one pass” you’ve probably forced from a straightener at one point or another. Because we’ve all used our older sister or roommate’s flatiron, cranked up the heat to Thanksgiving turkey levels, and sizzled and steamed our way to a pin-straight press. Not the case with this straightener. The difference with the Bio Ionic OnePass is that I can actually use it as a one-pass iron. And if you’ve got curly hair, you know that’s nothing short of a miracle. 

Before: Curly, frizzy, and unblesst by the OnePass.

Shanna Shipin

I don’t generally use the hair typing system since I sit between a few, but my pattern has everything from 2Bs to 3Bs in it, with a solid amount of frizz. It’s relatively thick and medium-to-low porosity—meaning it’s difficult to penetrate the strands with moisture, but it’s not particularly hard to style. In fact, heat truly loves my hair—and it’s part of the reason I’ve been a straightening fiend since I hit puberty. Another reason? When I straighten my hair, it stays straight—for days. And curly girls know, sometimes you just want an easy style to stay put without having to refresh it every morning. Bio Ionic does that for me, but takes it a step further by cutting down my styling time. 

I’m a meticulous styler so it usually takes me around an hour to straighten (and then wave) my hair—but with the Bio Ionic OnePass, it takes me 45 minutes max. That’s at least 15 more minutes to make coffee in the morning or, let’s be real, lay in bed and scroll through Instagram. And I don’t have short hair—it reaches down to the middle of my back. 

When I first opened the Bio Ionic flat iron, I noticed the slightly matte finish on the outside and the pretty denim blue of the ceramic plates. It’s nice and light and also fits into your power socket without covering the other outlet (this is not a performance point, but when styling for longer than 20 minutes you know you may as well charge your phone and play some music!). The iron leaves out the bells and whistles newly launched tools lean into—there are no special settings, touch screens, or fancy chimes to let you know when it’s ready for use. You just hit the “on” button, adjust the plus or minus sign to set your temperature, and you’re good to glide. It takes seconds to heat up the plates (which go up to 450 degrees), but the handle itself doesn’t get hot unless it’s on for at least 30 minutes. 

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