Liquid Bullet-Proof Armour
Why Worldbuilding Stack Exchange recommends it
Worldbuilding Stack Exchange answerers link it as a quick visual example of shear-thickening fluid armour that resists fast impacts but flows under slow pressure.
Recommended by 1 people across 1 different months, 2015 to 2018.
What it is
A short 2006 clip showing a demonstration of liquid body armour, a fluid that stiffens on impact to stop bullets. It is a brief demo with no detailed technical explanation.
What people said
Recommends Sasugasm · 2018-03 · Worldbuilding Stack Exchange · on “Creating a scientifically semi-valid super-soldier, part 3: Physical shock resistance”
@Raditz_35 when making this answer, I had in mind this video : [this video] if this can help you get a better view :)
Cites Isaac Kotlicky · 2015-03 · Worldbuilding Stack Exchange · on “Lifeform - resistant to gunfire but vulnerable to melee”
On the contrary, naturally springing feet would be a distinct advantage! [this video] [LINK] here's your bullet-proof liquid armor. But it's also resistant to stabbing blades, so swords aren't really going to help. You would be slashing too slowly to do any real damage.
Cites Pelinore · 2018-04 · Worldbuilding Stack Exchange · on “What materials would we need to have melee weapons and body armor become the norm?”
How about a custard filled ballistic vest? What you may be looking for is a non newtonian fluid, something that stiffens when sudden kinetic force is applied to it (like custard). So you might imagine a vest made of sealed sections (pockets or cells) & each of these sections filled with such a fluid. You couldn't shoot the wearer (through the vest) but you could stab him (through the vest), if you stab slowly enough (this is almost exactly the effect of the shields in Dune). For the actual material of the vest you probably can't beat Demigan's suggested spider silk, but I wouldn't know which of our currently available non newtonian fluids is best to fill it's pockets with. It probably won't