Materials Heat resistant hair fibers?

What kind of hair fibers for wig making are heat resistant? I've already did some research on it but I'm still a little confused on what is or isn't. So I'm hoping someone can make me a simpler list (I have a kind of learning disability so simpler is better for me to understand ) of "these are heat resistant/high heat tolerate materials," or even recommend me some shops that sell heat resistant hair wefts / wigs.

I want to make a wig for a doll of mine that has curly hair, but as a perfectionist when it comes to character design, I want to make certain curls as accurate to my drawing as possible and using heat to make bigger and smaller curls seems like a good way to do it.

Pre-made heat resistant wigs I've found so far aren't the exact color I need, so I'd like to make my own by mixing different colors of hair wefts together. I've made wigs for my fashion dolls before using acrylic yarn which is heat resistant and I stylize the hair with small heat tools. But yarn hair wefts only get so long, and the lengths they get might not be long enough for the doll. As BJD heads are bigger than fashion dolls like Barbie and Monster High heads.

This hair design and colors I want to achieve if it helps at all or if you're just curious. But also don't look as it's old art of mine and I'm embarrassed.

Spoiler: Old Art

 

Ah I've bought from DollPlanet before! But I forgot to add I want to style it slowly by doing each curl individually. I've used boiling water to style my yarn hair before as well, but the hair cools down to quickly for the style I want to do. I was more thinking of using a small hair straighter I have (that has been great for smoothing out my yarn into looking like hair) to heat up locks of the hair on to a metal stick of sorts get each curl. My fear with using boiling water for the style is that it will cool down before I get to every curl, then I have to pour more water on it and it might ruin the curls I already made.

 

Ah I see that sounds like a good plan. It'll be awhile before I actually get the doll I want to make the wig for so if it happens to work out for you I'd love an update about it.

My only other method I thought of is curling locks of hair on a pipe cleaner and pinning it down, and doing the boil then ice water method as I've seen doll customizers doing such to give some dolls more tight-curled afros as seen here. Since it works at making such small and tight curls, I imagine the method can be used to make more thick curls too.