Factors to Consider When Buying Wigs for Women A number of factors determine the cost of hair wigs. Human hair wigs are among the most costly, however certain models are made of synthetic materials. The natural human hair combs are also among the most costly. While they're typically less expensive, they require more maintenance. It's possible that they'll be affected by humidity and the weather and may need to be dyed or styled for the best appearance. Due to these reasons, you should consider whether the cost of a natural human hair Bob is worth the expense.