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According to their webite, it's the lightest tactical armor in existance.

Flexibility
The only Level III ballistic vests that are flexible enough to wrap around the whole torso area that "move when you move". No more restricted movements when rappelling, fast roping, diving, entry work, sky diving or other rigorous activities. These vests wear like level III-A soft body armor.
Lightweight
The lightest overt tactical and only covert concealable vests offering this type of protection and coverage.

They seem to have plenty of customers. They sell it to foreign armies -- and one message board says "it's ideal for insurgents, who have to keep a low profile and move fast."

An extra large vest is nearly 20 pounds heavier than the Army's current armor, though Masters admitted it did have more rifle protective coverage than issued vests.

And just because they claim or actually do sell to other armies doesn't mean that they are suitable for our troops.

Trust me, I appreciate lightwieght body armor having had to wear stuff that wore me out just riding in a truck all day, not even getting out and patrolling.

But company propganda (read about what happened with Second Chance) is hardly an authoritative source.