I have the BV2S and I don't know what I'm doing wrong but I hate it.....It is good up to -20c and after that it fogs spots on the visor right where the intake holes are on mask that fits on your face. It ends up getting so bad that you can't see at all and you end up having to leave the visor open. My Honest opion if you ride -20c and colder I wouldn't buy the helmet.....if you don't it is a nice rig. I heard of guy's hot glueing one of the vents closed but I figure if I spend $600CAN on a helmet I shouldn't have to hot glue nothing.