The CPSC (Consumer Product Safety Commission) is a U.S. government organization that certifies bike helmets for safety based on a specific set of safety standards. The ASTM (American Society for Testing and Materials) is an independent, international, nonprofit organization that tests and certifies multi-sport helmets.All helmets are tested to ensure their effectiveness. When purchasing a helmet, locate the CPSC sticker on the inside of a helmet. Note that all CPSC stickers do not look the same.When purchasing a multi-sport helmet, an ASTM sticker should be displayed in addition to the CPSC sticker.