A kinda cool new winter tire concept for those icy days.
http://www.velotaf.com/information/6357/bike-spikes-la-neige-n-est-plus-un-obstacle
But here’s the real question… How does it handle in the pow?
About time someone invented something like that. Dry road handling is probably less than abysmal though, so the conventional metal studded tires are probably a better all around bet.