After analyzing thousands of impact tests over my career, I can tell you that the magic of a modern safety helmet happens in the partnership between its two core components: the outer shell and the energy-absorbing liner. They are the two pillars of protection. The outer shell is the first line of defense. Its job is to be tough, to resist puncture from sharp objects, and to spread the force of a broad impact over the largest possible area. The second pillar, the EPS foam liner, is the unsung hero. Its job is to make the ultimate sacrifice. As the shell distributes the force, the liner crushes, converting the deadly kinetic energy of the impact into harmless work. A great safety helmet, whether for sport or industry, is one where these two pillars work in perfect synergy. At SPIRIT, we spend countless hours engineering this relationship—perfecting the bond between shell and liner, and tuning the density of the foam to work in concert with the shell's material. It’s this unseen synergy that saves lives.