Factors to Consider When Buying Wigs for women There are a variety of factors that determine the cost of hair wigs. Human hair wigs tend to be the most expensive, but some models are constructed from synthetic materials. The natural human hair combs are also the most expensive. While they're often more affordable, they require more maintenance. The hair will react with humidity as well as the weather , and could need to be styled or dyed for the best appearance. Given these issues it is important to consider whether the cost of a natural human hair bob is worth the extra cost.