Important Factors to Consider when Purchasing Wigs for women Many factors influence the cost of an wig. Human hair wigs are the most costly, however some models are made from synthetic materials. The natural human hair combs are also among the most costly. While they're typically less expensive but require more attention. The hair will react with humidity and the weather and may need to be changed or dyed to appear its best. Due to these reasons, you should consider whether the price of a natural human hair bob is worth the additional expense.