Thermofibre Clip Ons ?

I've never heard of thermofiber synthetic hair.  Since it says you should be able to use heat, from my experience, most synthetics you can't use heat. 

The hair packaging or anything didn't have instructions on how to use heat? Like some take up to so n so temperatures.

I've had success with regular synthetics from clip-ins to weaves.

I'm not sure where your hair is from or how high quality is. I've used Plastikhaar, one of the highest quality synthetic hair and I was able to curl it and iron it on a low heat setting.

It was still perfect and fine. But you have to be careful with the heat settings. If it's too hot it will fry the hair and frazzle it. You won't be able to wear it anymore.

No problem!!

thermofiber isnt hard to curl once you get the hang of it. The key is that the curl needs to heat and cool in the same position. In otherwords, after you get the curl good and hot with your curling iron, then you need to carefully slide the curl off of the barrel without letting it drop or uncurl. Either hold the curl in your hand until cool or clip the curl in its curled position until cool. If you let the curl drop off of the iron the curl will fall out. Also, many brands of thermo need to be damp-to wet to curl well. It will sizzle when you use the hot iron but it should be ok. Experiment with different heat settings to find what temp is best for your particular thermofiber.