Important Factors to Consider when Purchasing Wigs for Women A number of factors determine the cost of the cost of a wig. Human hair wigs are most expensive, but some are made of synthetic materials. The natural human 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 might need to be styled or dyed for the best appearance. Given these issues you must consider whether the price of a natural human hair bob is worth the extra cost.