I’m not really sure. You may want to talk to a hairologist
From the sound of it the thermal one does more damage, i always feel my hair abit crispy when i straighten it using the highest temperature.
Hope i have helped
Sorry this isn’t totally what you are asking but I just wanted to tell you – I had my fringe straightened a couple of years ago, I don’t know the product but it was definatly chemical and then wrapped in aluminium foil (like highlights). Where it was put on my blonde highlights (which were more than 6 weeks old) it snapped off at the roots and looked terrible as it grew back. The parts that weren’t hi lighted were fine though after a couple of good conditioning treatments (like the poster before, it felt crispy straight after). I don’t know if you can tell which treatment it was from the description – just be aware if you are doing it on coloured hair! Sorry to be doom and gloom, like I said, the rest of the uncoloured hair was fine.
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