Okay. I broke down and bought a new Giro Atmos. Much to my surprise the ventilation is noticeably better than my old Trek! Even with a full head of hair, I can now feel the breeze. And of course to those designer-logo addicts I look cooler too. Dunno if it's really worth what I had to pay for it, but I do like the ventilation. Since the fit was fine with the Trek, I can't say I feel any improvement there.