Aspects to Take into Account When Buying Wigs for Women A variety of variables determine the cost of the cost of a wig. Human hair wigs are most expensive, although certain models are made of synthetic materials. Human hair is naturally laced comb hats are also the most expensive. Although they're usually less costly but require more attention. Hair bobs react differently to humid conditions and weather and may need to be dyed or styled to appear its best. In light of this you must consider whether the cost of purchasing a natural human hair bob is worth the added expense.