I was in a wide ranging conversation the other day (not all centered on guns) and somehow the topic of body armor came up as part of our (very eclectic) conversation. I pretty much pointed out that this is completely out of my wheel house, but it seems to me that he even knew less than I do (if that's possible).

Basically I said I think most body armor expires after a certain time, although I do not know why this is so. He was skeptical but neither of us could think of a good reason why (except maybe for the soft armor types) where the fabric will possibly degrade over time.

Can anyone shed any light on the subject (as to why body armor expires)?

Also does that apply to ALL types of body armor or is it just certain types (such as soft armor)? Let me know the cliff notes version if you can because I should see the guy again soon and I told him I would ask people in the know.

Thanks!