Obviously living in the So Cal desert as I do my cold weather needs are not nearly as intense as they are for many of you, at most all I need are long pants a medium weight jacket and some light gloves - - the one thing other than this that really makes my rides much more comfortable when its cold is my Bell Vortex full helmet - 8 1/2 months or more out of the year I wear the lightest little dot approved 1/2 helmet I could find at the time I got it, but when it gets in the 40's and 50's my nose starts to run and my ears get so dang cold they hurt - - thats when I switch to my full helmet.
those other 8 1/2 months the full helmet would be way too hot and for these times the 1/2 keeps me legal and I like the protection out on the highway
when the temp drops the full keeps my ears and nose nice and comfortable and makes it worth looking like I just stepped out of a Star Wars sequel
just got a new High Visibility yellow shield for the Vortex today - - makes it easier to see driving home after the sun has gone down - - would have liked a photochromic shield but the dang things cost more than the helmet did
Winter Helmet :
Spring, Summer, Fall Helmet
so anyway - thats my cold weather riding tip - even if you normally dont like a helmet, and even if it may not be required in your State I can guarantee that for controlling the air flow and temperature of my head I havent found anything that works as well, and I have tried