>>63947297>Motorcycle armor tends to have bits of Kevlar sewn into strategic locations to cut down on road rash and whatnot, per my understandingSome jackets are actually made with layers of kevlar.
It depends on what brand and price point, honestly.
I have a leather jacket myself that probably weighs ten pounds.
It's incredibly thick, and backed with abrasive resistant fabric material of some kind.
It has integrated impact resistant gel inserts in the elbows, shoulders, and along the entire length of my spine.
I also paid like $350 for it, because it's meant to keep my skin on my body and make sure my spinal cord doesn't snap in the event I hit the ground at like 150mph.
Against knives, it probably wouldn't do much.
I'm sure it'd slow down a stab slightly, but not enough to matter.
It would probably slow down a slash a great deal more, and any impact from a blunt object would actually be considerably lessened, because it's sort of designed with abrasion and impacts in mind.
Bullets are probably going straight through.