Important Factors to Consider when Purchasing Wigs for Women A number of factors determine the price of a wig. Human hair wigs tend to be the most expensive, but some models are made from synthetic materials. Human hair is naturally laced comb hats are also among the most costly. Although they're generally less expensive but require more attention. The hair will react with humidity and the weather and might need to be changed or dyed to look its best. Because of these factors you must consider whether the cost of a natural human hair bob is worth the extra expense.