On the other hand, synthetic Hair Systems are made of nylon or acrylic. Hairpiece Warehouse toupees are popular because they are not only inexpensive but also retain their shape and colour with minimal upkeep. The problem is that the fibers are sensitive to heat and can melt if exposed to excessive heat. The Hair System hair is attached to a cap made of a transparent, very durable lace fabric. Because it is so discreet, most people will mistake it for your natural hair, and you'll receive many compliments.