When selecting safety helmets, the most critical factor is compliance with international safety standards. For the US market, ensure the product meets ANSI/ISEA Z89.1, which classifies helmets by Impact Type (Type I for top impact, Type II for top and lateral impact) and Electrical Class (Class E for high voltage, Class G for low voltage, and Class C for no electrical protection). For European markets, look for EN 397 certification. Always verify that the CE or ANSI mark is permanently molded or stamped into the helmet shell to ensure authenticity.