Today I ran 5 miles on snow and ice covered trails in Mohican. More important I tried my new kahtoola micro spikes. They are designed to fit over my running shoe and have some 3/4 inch spikes that give plenty of traction in snow. The only problem I noticed today was mud and leaves would clog in the spikes. This was probably due to only 1-1 1/2 inch of snow on the ground, allowing the dead leaves on the ground to get caught in the spikes. No problem, just scuff the spike on the ground while you run and the clogs fall off.