The most modern US body armor, the improved tactical vest weighs 3.5 pounds (1500 grams) but this is the under armor , basically an arming jack. With the plate carrier and the rest its 35 pounds near 16 kilosYeah SCA noob armor tends to be very light hard plastic, but man a good steel breastplate feels good to wear by comparison, even with the added weight. Not having everything shift around or pinch or whatever when you move too much makes a huge difference.
IME and in the XP of reenactors who are also veterans that I know, the Kevlar and plate body armor in question is only really comparable in weight and total thickness (including gambeson) to any medieval armor, but “comparable” is a term with a ton of variation based on the POV of the speaker.
By comparison back and breast plate and an arming jacket is probably 25% lighter and as such is much easier to wear.
Fitting also counts. A custom breastplate (what 3.5 called masterwork) would fit better than an off the rack one and as best as I know, none of the modern body armor plates or the like are custom fitted. Technically soft body armor can be bought like this but you won't see it on a battle field , it may not meet mil-spec and it wears out.
Kevlar body armor cared for properly lasts 5 years, 7 for some brands and needs to be replaced. No way is the military going to do that on a very regular basis and so while it works, you get what you get.
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