Surely there are enough soup kitchens or homeless shelters that need volunteers that uber bored middle class Americans don't need to impact their longevity, however minimally, by performing modifications on perfectly good bike helmets? WTF? I am, as I said, old enough to have ridden more years before bike helmets were invented than since. The first examples were reputed to be very hot, heavy and uncomfortable. I haven't heard that this has been a significant issue in decades. That's right. Decades. They got to something people could wear in reasonable comfort by at least 1990. Even the hockey style helmets a la Bell have figured out a way to get air movement through the shell and/or sweat absorbent padding inside the shell. The main takeaway being that some discomfort, as long as it does not rise to the level of a distraction, is preferable to being unprotected. I doubt that there is much excess capacity in the average helmet to allow for any reduction of the crushable impact absorption. So.... again. Why bother wear a helmet at all? I know of no jurisdiction where it is illegal not to wear a helmet and if one is so unlucky as to incur a head injury while riding without a helmet, I know of no medical facility that would refuse treatment. They save gangbangers with life threatening bullet wounds, they will do their level best to pull a cyclist through the worst despite their obvious cavalier attitude towards personal responsibility. This thread is one of the more absurd in recent days.