I have the LG one from Nashbar. Trouble is, my head sweats mightily under it. I just need the ventilation more than the helmet cover. Even in January.
What kind of fabric is the LG cover made from? I haven't really sweated under my Metro's cover. Then again, my head doesn't sweat a lot to begin with -- my lower back sweats first; and I tend to only use it in the rain or cold. Mine is made from just a medium weight lycra/spandex/stretchy-synthetic-fabric with no waterproofing... I
think.