Important Factors to Consider when Purchasing Wigs for Women A variety of variables determine the price of hair wigs. Human hair wigs are most costly, though some models are made from synthetic materials. Hair lace made from natural hair combs are also among the most costly. Although they're usually less costly however, they need more care. The hair will react with humidity and weather , and could need to be styled or dyed for the best appearance. Because of these factors it is important to consider whether the price of a natural human hair bob is worth the added cost.