User blog comment:Callummacdonald79/astartes anatomy/@comment-1713318-20130219073205/@comment-3258762-20130314165550

Well, imagine if you have a crotch guard made of metal being kicked into your groin. That is a kick only slightly reduced in force AND a piece of metal punching into your groin

Hollow point crotch guards (the normal form of crotch guard) is that you have, say, a hardened silicon shell that is hollow on the inside. That way, the impact is dissipated across the entire hollow point instead of redirected into your groin. Still hurts but not nearly as much.