Flat Irons 101: A Guide to Sleek, Straight Hair | Paul Mitchell® (2025)

Flat Irons 101: A Guide to Sleek, Straight Hair | Paul Mitchell® (1)

How-To 3 min read

Written by Team John Paul Mitchell Systems

Not all hair irons are the same. Sometimes called flat irons, hair straighteners or styling irons, their surfaces may be constructed of ceramic or titanium and their plates often vary in size. They can be used to create a variety of hairstyles from a sleek, straight look to romantic, loose curls and even used to make beach waves. How do you choose the right tool? Here are the basics to help you find the best flat iron for all your styling needs.

Flat Irons 101: A Guide to Sleek, Straight Hair | Paul Mitchell® (2)

Ceramic of Titanium?

It's not just a material preference. Both Paul Mitchell Flat Irons and Neuro Flat Irons have spectacular options. Choose the plate surface that best suits your needs.

Ceramic plates are easy to use since they heat evenly, minimizing the potential to burn your hair and offer ionic technology that helps tame frizz for healthy, shiny results.

Premium IsoTherm titanium plates have the ability to heat higher temperatures to smooth very thick or textured hair types. Titanium is also known for keeping the plates evenly heated throughout styling.

Flat Irons 101: A Guide to Sleek, Straight Hair | Paul Mitchell® (3)

Size Really Does Matter

Choose the best plate size for your hair type and the style you desire.

1.5" This extra-large plate size is ideal for straightening long, thick or coarse hair types and for smoothing larger sections of hair in less time.

1.25" This standard plate size is ideal for all hair types and for providing superior straightening abilities for a completely straight, smooth look.

1" This smaller plate size is versatile enough to straighten and curl. It can be used to smooth smaller sections of hair like tendrils and bangs.

Flat Irons 101: A Guide to Sleek, Straight Hair | Paul Mitchell® (4)

Round It Up

Some flat irons like Express Ion Smooth+ 1.25" Flat Iron and Neuro Smooth 1.25" Flat Iron have plates with beveled edges that are rounded to ensure that there are no lines of demarcation or bends on the ends—perfect for straight, sleek looks.

Some styling irons like Express Ion Style+ 1" Flat Iron and have rounded beveled edges as well, but are also rounded in shape making it easier to wind sections of hair around them to create curls.

How to Handle the Heat

  • As a general rule, the finer the hair, the lower the heat setting should be on your heat styling tool.
  • Always apply a heat protectant like Neuro Protect or Paul Mitchell Hot Off The Press before heat styling with irons.
  • Start with the recommended heat settings for your hair texture, then decrease or increase heat as needed.
TEMPERATURE SETTING HAIR TYPE
250-290°F (121-143°C) Fragile, Very Fine
290-330°F (143-166°C) Fine
330-370°F (166-188°C) Medium-Textured
370-410°F (188-210°C) Thick
410°F (210°C) Coarse, Very Thick

Flat Irons 101: A Guide to Sleek, Straight Hair | Paul Mitchell® (5)

Hot Off The Press
$24.00

Flat Irons 101: A Guide to Sleek, Straight Hair | Paul Mitchell® (6)

Neuro Protect
$28.50

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Flat Irons 101: A Guide to Sleek, Straight Hair | Paul Mitchell® (2025)
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