Skull Crush Carbon Fiber Helmets are handmade in the United States. Carbon Fiber, along with Kevlar, are the two highest weight to strength ratio materials available for helmet manufacturing applications. Carbon fiber is about 5X stronger than traditional steel. A single strand of carbon fiber is as thin as a hair and is capable of supporting the weight of a person. Skull Crush helmets are made by creating an ultra-tight woven blend of both Carbon Fiber and Kevlar.