Important Factors to Consider when Purchasing Wigs for Women A number of factors determine the price of a wig. Human hair wigs are most costly, though some models are constructed from synthetic materials. Hair lace made from natural hair combs are also the most expensive. While they're often more affordable but require more attention. They'll react to humidity as well as the weather and might need to be changed or dyed to look its best. Due to these reasons you must consider whether the cost of purchasing a natural human hair bob is worth the additional cost.