"Rated 4A for bullet proofness, explosives, cuts, stabs and impacts."
The Trooper series from Rubicon Industries is probably the second armorseries you will encounter. It is better than the HVM Kevlar series but defensively inferior to the Special Forces series, which is also made by Rubicon. They usually come with physical resistance, a few heat resistance & little-to-no chemical resistance. It is encountered early level, with the version appearing as far as the level 50's and possibly being dropped by level 30.