it's one that's only getting worse. >> ballistic designer underwear. >> you say the words anti-ballistic boxers or bulletproof briefs and people laugh. look what it does to this bullet. a bullet being repelled in part by new strengthened silk underwear. british troops are already wearing it. the marine core put it in request. from kevlar cups to something shaped sort of like a diaper. >> they all work to slow down fragments, we're looking to prevent penetration of the genitals and the lower abdomen. >> you hear the boom when the ied goes off. what you don't see is all the sand, grit and debris that gets sucked into the explosion.