As an engineer at heart, I can tell you that the performance of a bike helmet begins long before the molding process—it begins with the molecules of the raw materials. At SPIRIT, we are meticulous about material science. The outer shell of our helmets is typically crafted from high-grade polycarbonate, chosen for its exceptional impact resistance and light weight. But not all polycarbonate is created equal. We source from suppliers who can guarantee consistent thickness and purity, which is vital for the in-mold process where the shell and foam liner are fused together. The heart of the helmet, the EPS (Expanded Polystyrene) foam, is even more critical. We work with our suppliers to develop specific densities of EPS, sometimes using dual-density foams in a single bike helmet. A lower-density foam might be used in the upper sections to absorb energy from a direct impact, while a higher-density foam is used around the base for durability and to handle secondary impacts. This level of detail ensures optimal energy management in a crash. This deep, scientific approach is what elevates a SPIRIT-produced helmet from a simple piece of plastic to a life-saving device.