Well I confess: I have the bona fide coolest helmet, an old 1/2 shell which I repainted matte black and adapted as follows. Removed styrofoam shell and used a hot wire to melt air channels into the styrofoam, leading from the leading edge and fanning out to the side and read edges. Depth each channel 1/4"-3/8". Then reassembled. Someone will probably excoriate me for compromising my helmet safety. But as I see it, while I may have reduced the impact absorption, that marginal reduction is outweighed by the reduction in the temptation not to wear it (live in FL) and the increased endurance of my attentiveness. My theory was that the air flow hitting the front of the helmet would by its own pressure circulate within the helmet and it sure enough does. Please--no excoriation!
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