Important Factors to Consider when Purchasing Wigs for Women A variety of variables determine the cost of hair wigs. Human hair wigs are the most costly, though some are made of synthetic materials. Natural human hair lace combs are also among the most costly. Although they're usually less costly but they're more prone to wear and tear. They'll react to humidity and the conditions and could require to be restyled or re-dyed to appear its best. Due to these reasons, you should consider whether the price of a natural human hair bob is worth the added expense.