In the real world. These items will have an incredibly thick armor within to withstand bullets. These can do without considering BBs cannot penetrate them anyway. Even so, airsofters love the look of armor, even with it comes to heavy duty armor. These won't weigh you down, but they'll cover those areas you think would be vulnerable.
These protected areas include the:
Neck, both sides
Hips, both sides
Constructed by INVISTA CORDURA nylon and UTX Clip with mililtary-spec. sewing.