Synthetic hair weave is made of plastic fibers, nylon and chemicals.
The two major kind of synthetic hair are Toyokalon and Kanekalon. They both are from Japan and made of plastic. Since they are totally chemical products, their texture are coarse and rough and easy to get tangled. Also, heating appliances shouldn’t be used including dryers or flat irons. But as their price much lower than natural human hair, they’re still good choices to make hair braids for short term hair extensions.