Factors to Consider When Buying Wigs for Women Many factors influence the cost of an wig. Human hair wigs are most costly, though some models are made from synthetic materials. The natural human hair combs are also the most expensive. While they're often more affordable however, they need more care. They'll react to humidity and weather and might need to be styled or dyed for the best appearance. Because of these factors you must consider whether the cost of purchasing a natural human hair Bob is worth the expense.