Factors to Consider When Buying Wigs for women A variety of variables determine the price of an wig. Human hair wigs tend to be the most expensive, but some are made of synthetic materials. Hair lace made from natural hair 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 and the weather and may need to be changed or dyed for the best appearance. Because of these factors, you should consider whether the cost of purchasing a natural human hair bob is worth the added expense.