CPSC is the US equivalent to CE EN. The CPSC 1203 rules are a little bit more stringent in terms of the impact test, meaning that helmets can meet the CE EN 1078 standard with thinner foam and lighter weight than the US CPSC 1203. There are four major requirements a bike helmet needs to surpass the certification: Peripheral Vision Test, Positional Stability Test, Retention Strength Test and Impact Attenuation Test.
