what kind of hair used to make hair extensions?

    The hair that is used for extensions can be human or synthetic. 

Synthetic hair is the most affordable option, but it also lacks in versatility. It’s essentially plastic so you can’t use heating tools on your synthetic hair extensions and Synthetic hair is also less durable than human hair. They also cannot last as long or stay as beautiful as human hair because of the lower quality.

Human hair extensions are a little more expensive, because it is carefully collected from a single donor in such a way that the cuticle is kept pointed in the same direction as the hair next to it. you can treat human hair extensions as your natural hair. You can style, curl, straighten, and blow dry  etc. that’s why when shopping for hair extensions you will hear the name "human hair" a lot.

In general, Both are great choices for you depending on your budget, time, and needs.