+1 My helmet covers are used according to temp. I've got 2. One's for cold/dry weather and the other's for wet/rainy conditions whether warm or cold. I use a balaclava under my long-sleeved poly-pro hoodies. If it gets really cold I've got a face covering heavy weight balaclava and ski goggles. It's been a pretty mild winter here this year, so I haven't had to use that combo.