system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how do stab/cut proof shirts work?

A buddy of mine works with glass and they recently gave out stab proof shirts, we tested it out and you can not cut through, even with a sharp knife the material couldn't be stabbed through. It feels like normal fabric how does this work?
gpt
The threads are made out of Kevlar in many protective fabrics.  They are knitted into a loop-locking fabric so that there aren't slots for the knife to get through.  It's not a cool as chain mail, but much lighter.