The new Conquer Helmets are SNELL SA2020 Certified, see the below link for more information and to see Conquer Helmets on their list:
Here is how SNELL arrives at their strict standards for the 2020 certification (very informative:
https://smf.org/standards/sa/2020/SA2020_final.pdf
This link has a bunch of frequently asked questions regarding the SNELL certification, including why DOT helmets are different than SNELL:
Snell Certification: Snell releases a new helmet standard every five years
Helmet shape : Intermediate Oval