The majority of human hair wigs on the market are made from Asian hair. Most of it comes from China, although higher quality Asian hair comes from women who live in India or Pakistan. Asian hair by its nature is thick, straight and usually very dark in color. Obviously this hair is great for making straight black wigs, but to make a blond curly wig it has to go through several bleaching steps and other chemical treatments. As a result, the hair gets damaged and a wig that looks great, when new, might become dull in a few months.
The best quality hair for European-looking wigs comes from Eastern European countries, like Poland and Russia. This hair costs more than Asian hair, because in these countries not so many women are willing to sell their locks. Wigs that are made from European hair last longer and feel softer to the touch.
When buying a human hair wig, be sure to find out from where the hair originates. If you are prepared to spend several hundred dollars on a wig, it is best to find one made from European hair. If the wig label says "human hair wig" without specifying the origin of the hair, it is most likely made from Asian hair.