Straightening irons, straighteners, or flat irons work by breaking down the positive hydrogen bonds found in the hair's cortex, which cause hair to open, bend and become curly. Once the bonds are broken, hair is prevented from holding its original, natural form, though the hydrogen bonds can re-form if exposed to moisture.[2] Straightening irons use mainly ceramic material for their plates. Low-end straighteners use a single layer of ceramic coating on the plates, whereas high-end straighteners use multiple layers or even 100% ceramic material. Some straightening irons are fitted with an automatic shut off feature to prevent fire accidents.
Unlike the Bio Ionic’s handy digital temperature control, the Chi Air uses a small dial on the side of the tool that’s harder to read. The dial’s placement makes it not only more difficult to get an accurate reading, but also more prone to being hit by your hand and switching to a new temperature. That being said, most of our testers didn’t mind this minor inconvenience since they don’t expect to change the tool’s temperature often.

Weighing just over 1 pound, the BaByliss Pro Nano Titanium Straightening Iron is the lightest hair straightener on our list of the best flat irons! This lightweight design makes it a great choice for users that are constantly on the go, and even when traveling. In fact, this model might make a wonderful “second straightener” for someone that wants to keep their locks looking fine on the road without toting around their heavier at-home hair straightener!
Lifters who are deadly serious about their training, and who prove it by doing the serious exercises - the BIG movements -- exercises like squats, front squats, bench presses, barbell bent-over rowing, deadlifts, Trap Bar deadlifts, standing presses, push presses, power cleans, power snatches, and jerks. Lifters who finish every workout covered in chalk and sweat - and who've been doing it that way for a long time. 

Nor does it speak to those of us who work long hours at our job - who support our families and who struggle with issues like how to pay the bills or how to put the kids through college - who have limited time and energy for training - and who are more interested in how to train for lifelong strength and health than in how to gain 30 pounds of muscle in six weeks.
All this is so well documented and that's great! I have poker straight hair but I crave for curls and more volume all the time. I also use flat iron to curl my hair but the difference is - I'm NOT able to do this good job. But it is also damaging my hair so I'm trying some more ways to curl my hair without heat which I read here http://thelifesquare.com/how-to-curl-your-hair-85...And I must say one of them worked for me really well.
If you're looking for style versatility, NuMe hair straighteners are designed to do it all and allow for some creativity too. Each authentically crafted NuMe hair straightener offers only the highest quality materials, including 100 percent pure tourmaline ceramic, stone ceramic, and titanium plates. With beveled edges and floating plate design, you'll never snag your locks or be confined to one style. Create fashionable curls, crimped looks, relaxed beach waves and so much more. Unlock the possibilities with your NuMe hair straightener. 
I've owned a Conair, Chi, and I-Tech straighter before, but this one is FABULOUS! A lot of research was done before I made the decision to purchase this one, and I feel like it paid off; my previous straightener was 4 years old, so it was about time. I received this new one today before I got home for my lunch break, so I had to go ahead and bust it in ;) 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, like it adds more shine like no flat iron has done before. Mind you, my hair is very difficult to deal with. I am a Caucasian, but my hair has always been coarse, wavy, dry and thick! This iron worked beautifully on my hair. 10/10 would recommend! If it doesn't work the same after a few months, I'll be sure to update my review. As of today, I'm very happy! :)
While temperature control is typically a good thing to have in a hair straightener, it can also result in hair damage if you're keeping the temperature too high. The GHD Gold eliminates the chance of any user error, operating at an even 365 degrees Fahrenheit. This is the optimal temperature for most hair types, getting you smooth results without damaging your hair. The gold coated ceramic plates heat up quickly and maintain an even temperature, eliminating the chance for any hair damaging hot spots as well.
An upgrade from their since discontinued Eclipse Styler, you won't be tempted to heat this flatiron up to 450 degrees, because the temperature dial is always stuck on one number: 365 (the ideal heat to mold hair without frying it, according to the scientists at GHD). Underneath each of those 365-degree plates are three fancy sensors that measure the density of the hair in the iron so that it can maintain consistent heat regardless of the chunk of hair you grab. The result? Silky, shiny hair with zero frizz.
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