Material science is a study in trade-offs. Weight, rigidity, toughness, dimensional stability. Improve one characteristic and you can often compromise another. CeraShell® is Marathon’s answer to that engineering problem. Developed for the next generation of Navigator watches, CeraShell combines bio-sourced polymer with ceramic powder to create a lightweight, reinforced composite case. The polymer matrix provides the structural foundation, while the ceramic component contributes to the material’s mechanical properties. When paired with the aluminum bezel, the result is a case engineered to deliver strength and durability without the mass of an equivalent steel construction. For an instrument originally developed for military aviation, that distinction matters. Every gram contributes to the total load carried by the operator, and every component must justify its place. It’s materials engineering in service of a decades-old design principle: maximize capability while minimizing unnec...