Mutation Vest (AKA Mutation Armor), is a special item for Mutation Mode. When equipped, Soldiers have one-hit protection against the Mutants (The small Nano Armor icon displays and will disappears upon first hit), and as a Mutant, they will have 1000 armor (This works together with normal armor, so a Mutant can have 1100 armor in total). Armor for mutants won't regenerate, but it will come back when the mutants respawn (HM/HMX). This is a very useful item as the soldiers will have more chance to escepe from the Mutants, and the Mutants can live longer to get to the Soldiers.