Aspects to Take into Account When Buying Wigs for women Many factors influence the cost of hair wigs. Human hair wigs are among the most costly, though certain models are made of synthetic materials. The natural human hair combs are also the most expensive. While they're typically less expensive but require more attention. Hair bobs react differently to humid conditions and the weather and may need to be dyed or styled for the best appearance. Due to these reasons it is important to consider whether the expense of a natural human hair bob is worth the additional cost.