I bought one of these helmets a couple of weeks ago to try and get some relief from the heat. It is amazing how much difference the vents make. It looked to me as if the vents were covered by the liner and that now air would flow thru by the channel inside the hard foam allow the air to move quiet well. Also it is one to the best fitting helmets I have worn. I suppose my head is the same shape as the helmet. I would definitely recommend this helmet to anyone wanting more air flow and a shorty helmet.