Type II Bulletproof Armor (5e Equipment)
From D&D Wiki
Type II Bulletproof Armor
Most bulletproof armor is made from ballistic paneling that chips away on impact, redirecting the force of a gunshot. Type II is designed for high velocity, small caliber weapons, such as relatively high-power pistols. This is the level of armor commonly seen among law enforcement and civilians. Most forms of this armor can be concealed under a shirt.
Usage notes are unresearched speculation designed to give perspective only. The DOJ standard is only used to distinguish between different levels of armor, and applies generalizations so it can be adapted for D&D. Please, don't take this stuff literally.