Important Factors to Consider when Purchasing Wigs for Women Many factors influence the price of an wig. Human hair wigs are the most expensive, although certain models are made of synthetic materials. The natural human 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 as well as the weather and may need to be styled or dyed to appear its best. Due to these reasons, you should consider whether the price of a natural human hair bob is worth the added cost.