Metals such as aluminum can also form foams -- and because of their greater rigidity, they could, in theory, dissipate as much energy as a polymer foam in a much thinner layer.
The car is also made of strong yet lightweight carbon-fiber-reinforced polymer, which makes it about 220 pounds lighter than an equivalent aluminum design.
由于车体使用坚固且轻质的碳纤维加固合金材料，因此该车比同类的铝材料设计约轻220磅。
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Phenolic foam material is a kind of polymer organic hard aluminum foil foam products, is made of thermosetting phenolic resin foam.