I came here in a time machine, that you invented.
If you get that reference, than please remember the device that Doc Brown is wearing on his head when he Marty shows up at his door. This is the Giro Prolight helmet. This thing is way to round and enormous. I know people don't like to admit it, but cyclist/triathletes are insanely vain/visual people and this thing looks ridiculous. Way too big for my head. I would recommend going to a bike shop and trying this on before you buy it.