What are mannequins made of? Modern day mannequins are made from a variety of materials, the primary ones being fiberglass and plastic. The fiberglass mannequins are usually more expensive than the plastic ones, tend to be not as durable, but are significantly more impressive and realistic. How much does a mannequin weigh? Kids headless mannequin is about 25 pounds And while some of the mannequins weigh up to 50 or 60 pounds, most weigh in at about 25 pounds. Most mannequins today are made of fiberglass, and the most modern, coated with a dark gray granite spray called Zolatone.