My maxtrax extremes have been a pretty big disappointment when it comes to even remotely cool weather. I have had to use them 4 times now, twice on actual snow, they worked great actually, the all plastic units get no traction, but with the metal studs they worked wonderfully. The reason I have been so disappointed is that in the two uses in rocks, both in cool, not cold weather, about 40F they have broken. MaxTrax service has been great, they will send me a box with prepaid shipping, I just need to put my broken one in the box, and they will send me a new one, but I'm pretty down on them because I don't want to keep sending them back, I want them to not break and actually exhibit the flexibility in low temperatures that they advertise, but that I definitely have not experienced. That said, my old x-bulls were absolutely useless in the snow, so cracked and broken maxtrax extremes still win out over those, but I feel they don't quite live up to the hype.