elcruxio is correct. Actually the worst thing you can do is over-dress. You haven't said where you are from so I really don't know what "winter" means to you. Here in Minnesota it can be anywhere from 24 (like today) to -15 (F). On the bottom I wear Lake boots (winter boots) with wool socks, long underwear and rip-stop pants for just about any temperature. On the top it varies from a thick jersey under a nylon shell to a couple of layers or wool under the nylon shell. On the hands I have some fingered gloves which are good down to freezing, lobster claws down to 20, and choppers for anything lower than that. On the head it's a balaclava (turtle fur makes a good one) and a ski helmet.