Which aspect is important when considering the lifespan of a helmet?

The lifespan of a helmet is significantly influenced by the material used in its construction and how that material endures over time. Helmets are designed to protect against impact, and the effectiveness of that protection can diminish if the materials degrade due to environmental factors, wear and tear, or aging. High-quality materials, such as polycarbonate or fiberglass composites, offer better durability and resistance to damage over time compared to lower-quality alternatives.

Understanding the material properties informs users about the helmet's lifespan and its ability to maintain safety standards throughout its use. Regular assessments of the helmet's condition, particularly for signs of cracking, wear, or other forms of deterioration, are crucial to ensure continued effectiveness in protecting the wearer.

Other factors, like brand, design trends, or cost, do not directly address the physical characteristics of the helmet, which determine how well it can serve its protective purpose over time. Therefore, focusing on the material and its durability provides the essential information needed to evaluate a helmet's lifespan effectively.