There are many different types of hair extensions on the market, both made from human hair and synthetic hair. 'Hair weave' is synthetic or real hair that is loose and attached to a sewn weft track, the weft can be sewn to the hair in cornrows or glued in. Another method is 'bulk hair', this again can be either human or synthetic; the synthetic hair comes as dreadlocks, braids and microbraids.
There is great demand in the Britain and the USA for real hair extensions, and some people choose synthetic hair over human hair for ethical reasons. Human hair is typically sourced from developing countries, and is cut from some of the poorest women in the world. Hair exporters made over $300 million last year, yet a lot of women will receive $10 if they are lucky, and many women receive nothing.