[discflinger]

Looks like you've gotten lots of great advice here. Layer, layer, layer. Take them off as you warm up.

The only thing that I can add is to pre-freeze(for lack of a better term) your discs before you throw them so that they don't melt the snow and form ice on them. Just leave them out in the trunk for a bit before you head out or if you already keep them in your car, you're set.