Re:won't kevlar still be the weak link? (Score 1)

I think the way that kevlar and other ballistic fabrics work is that the impact of the projectile splits the fibers into a bunch of little fibrils, and this splitting consumes enough of the kinetic energy of the projectile to reduce the damage it does to the body behind the fabric. I guess if you dropped a helmet from a high enough distance on a sharp enough object, that might split some fibrils and decrease the energy absorption of the fabric, but I really doubt that a few casual drops onto the ground would render the helmet useless, even over a small region. This is especially true if there are multiple layers of fabric in the helmet.