Which factors can degrade the effectiveness of a helmet over time?

Exposure to sunlight, heat, and chemical cleaners is a significant factor that can degrade the effectiveness of a helmet over time. Helmets are typically made from materials that can be sensitive to UV rays, which can weaken the plastic and degrade its structural integrity. Prolonged exposure to high temperatures can also cause the helmet's materials to warp or soften, negatively impacting its ability to absorb impacts during a fall. Additionally, many chemical cleaners can react with the materials of the helmet, leading to deterioration that compromises safety.

While continuous use and sweat buildup, improper fitting, and frequent washing can also affect a helmet's performance, they do not have the same immediate impact on the physical materials of the helmet as environmental exposure to sunlight, heat, and harsh chemicals does. Addressing these specific elements is crucial for maintaining helmet effectiveness over time.