Never mind the chainmail bikinis—what about those awkward breast plates in armor that we see frequently in fantasy artwork and at the Ren Faire? Whenever women complain about this convention, they are usually shot down for trying to erase women’s true bodies, for insisting that women make themselves more “male” in order to appear strong and capable.

But here’s the thing: those shapely bits of armor would actually get you killed. So the complaint is entirely valid! Now, let’s talk about why.

Let’s start with some relevant history: armor was uncomfortable, guys. It was heavy, hot or cold depending on the weather, and it made you sweat. (Speaking as someone who has donned chainmail shirts before, I can attest to all of these things.) To negate some of its more uncomfortable effects, all armored soldiers wore padded gambesons and the like. Once this padding was added, the shape of the wearer was practically neutralized. So the need for special boob-shaped armor is already suspect at best.

Now we’ll apply some science!

Let’s begin by stating the simple purpose of plate armor—to deflect blows from weaponry. Assuming that you are avoiding the blow of a sword, your armor should be designed so that the blade glances off your body, away from your chest. If your armor is breast-shaped, you are in fact increasing the likelihood that a blade blow will slide inward, toward the center of your chest, the very place you are trying to keep safe.

But that’s not all! Let’s say you even fall onto your boob-conscious armor. The divet separating each breast will dig into your chest, doing you injury. It might even break your breastbone. With a strong enough blow to the chest, it could fracture your sternum entirely, destroying your heart and lungs, instantly killing you. It is literally a death trap—you are wearing armor that acts as a perpetual spear directed at some of your most vulnerable body parts. It’s just not smart.

That’s not to say that female armor cannot be shaped differently—in fact, it should be to account for differences in shoulder-to-waist ratios and more, as the military recently discovered. Some films decide to provide women with a shelf of sorts in the chest region and that choice, if well-designed, can be flattering as well as functional. But it still isn’t logical or necessary by a longshot.

So if you want to wear some sculpted armor to the Ren Faire because you feel fabulous-looking in it, go forth and have fun! But if you’re drawing lady soldiers, or creating female characters who are depicted as actual warriors, please err on the side of reality when designing their armor. Science says your boob plates are killing the women you hoped they would protect. And none of us want that.

Information on female armor obtained from My Gaming and Tumblr.

Emmet Asher-Perrin always has fun wearing chainmail shirts. You can bug her on Twitter and read more of her work here and elsewhere.