What are the shell thickness measurements for the crown and brim?

• A. Crown 0.065", brim 0.080"
• B. Crown 0.080", brim 0.090"
• C. Crown 0.052", brim 0.065"
• D. Crown 0.100", brim 0.100"

Answer: (A)

Shell thickness distribution in protective helmets is designed to balance weight, rigidity, and protection. The crown is kept thinner to minimize weight while still providing central impact resistance, while the brim is slightly thicker to enhance edge protection, deflect debris, and maintain structural integrity around the helmet rim. The measured values—crown about 0.065 inches (roughly 1.65 mm) and brim about 0.080 inches (roughly 2.03 mm)—reflect that design, giving the brim the extra thickness it needs without making the entire shell heavier. Other thickness combinations would either overbuild the crown or overbuild the brim or exceed typical PPE tolerances, which is why this combination is the standard pick.