There is a reason you have to add a metal plate to your ballistic vest for knife protection - kevlar alone will not stop knife penetration. No fabric type material I'm aware of will. That said, even assuming the author is really looking for more durable fabric that is less prone to ripping\tearing on sharp objects (metal clips on pocket knives maybe?) - I'd think looking for material with more rip stop ability MIGHT be a better question, although I think it would be a case of diminishing returns with regards to actual benefit vs comfort/stretch/ect..

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