NYC XYZ wrote:

Right -- I was only wondering, though, how they could sound as if
they're admitting that their helmets are useless! I mean, I was always
suspicious of mere styrofoam, but if even they themselves will say that
mere sunlight and heat can damage it -- and thus negate the whole point
of wearing one...well, I dunno, maybe helmets are for dummies who can't
see the contradiction in that!

Energy-absorbing car bumpers are made from EPS foam, like helmets.
Automakers don't seem terribly concerned about the implications of
exposing a car bumper to environmental levels of heat. Of course, they
know if they tell you "replace your bumper if it gets hot", then that
will make you less inclined to buy their particular product again,
whereas the functional monopoly on bike helmets makes any helmet
replacement an overwhelmingly likely sale for Bell Sports (who make
both Bell and Giro helmets).

Chalo Colina