Factors to Consider When Buying Wigs for women Many factors influence the cost of an wig. Human hair wigs are the most expensive, but some models are made from synthetic materials. Natural human hair lace comb hats are also the most expensive. Although they're usually less costly however, they need more care. Hair bobs react differently to humid conditions as well as the weather and may need to be styled or dyed for the best appearance. Because of these factors you need to think about whether the cost of a natural human hair bob is worth the added cost.