Factors to Consider When Buying Wigs for Women A number of factors determine the cost of the cost of a wig. Human hair wigs are the most costly, though some models are constructed from synthetic materials. Natural human hair lace comb hats are also among the most costly. Although they're usually less costly but require more attention. They'll react to humidity as well as the weather , and could need to be dyed or styled to look its best. Because of these factors you must consider whether the expense of a natural human hair bob is worth the additional expense.