Aspects to Take into Account When Buying Wigs for Women A number of factors determine the cost of a wig. Human hair wigs are most costly, though certain models are made of synthetic materials. Human hair is naturally laced comb hats are also the most expensive. Although they're generally less expensive, they require more maintenance. Hair bobs react differently to humid conditions and weather , and could need to be changed or dyed to look its best. Given these issues, you should consider whether the price of a natural human hair Bob is worth the expense.