Important Factors to Consider when Purchasing Wigs for women A variety of variables determine the cost of hair wigs. Human hair wigs tend to be the most expensive, although some models are made from synthetic materials. Hair lace made from natural hair combs are also the most expensive. Although they're usually less costly however, they need more care. They'll react to humidity and weather and may need to be restyled or re-dyed to appear its best. Because of these factors, you should consider whether the price of a natural human hair bob is worth the extra expense.