The best concealable bulletproof vest - Ace Link Armor
In general, a soft armor bullet proof vest can weigh around 5-8 lbs, however, the lightest concealable kevlar vests like the Ace Link Armor APEX Armor T-shirt weigh only 3 lbs, and is super comfortable. Hard ballistic panels weigh a lot more than bullet proof vests. Steel plates are the heaviest, and PE plates are the lightest.