The text of the bill bans 'enhanced body armor'
https://www.metabunk.org/attachments/honda_responsiblebodyarmorpossessionact-1-pdf.8380/
Content from external source
‘‘(36) The term ‘enhanced body armor’ means body armor, including a helmet or shield, the ballistic resistance of which meets or exceeds the ballistic performance of Type III armor, determined using National Institute of Justice Standard–0101.06.’’
NIJ 0101.06 Defines type II (not banned) a protecting against anything up to a 9mm FMJ (Full metal jacket) or .357 Magnum JSP
Or as describe by a body armor vendor:
http://www.bulletproofme.com/Quick_Answers.shtml
Content from external source
Level II-A could be the best choice if thinness, comfort and concealability are the most important factors, e.g., if wearing for long periods, or with a lot of movement. Most folks opt for the extra safety margin of blunt trauma protection with a Level II or Level III-A these days.
Level II is often worn by police officers. A great balance between blunt trauma protection, versus cost, and thickness / concealability / comfort. What we recommend most often if concealing under light clothing is a priority...
Level III-A is a little thicker, stiffer, heavier and more expensive, but will stop more of the uncommon pistol threats, for example, it is tested for 9mm sub-machine-gun and .44 Magnum. Plus it gives you more blunt trauma impact protection – possibly better to return fire in a gunfight.
Level III-A (commonly refered to as 3A) is what is being proposed as being banned.