4 stars
I have used my ExoSpikes hiking on a trail that was pure ice transitioning to hard packed snow, and on a trail run. Hiking on flat or uphill ice, I noticed a disconcerting amount of slip with each footstep as I toed off. The forward spikes are pretty close to the toe of my shoe - as close as my MicroSpikes. I think the Exos slip because the studs are shorter than the cleats on Micros, so the toe of my shoe doesn’t have to pivot as far before the stud loses contact with the ice. For some reason, I did not notice this slip when RUNNING on ice though. The slip was annoying mostly because I knew I was losing a bit of effort with every step. I have also hiked the same icy trail with MicroSpikes and did not feel any toe slip at all. I did not notice any slip under the heel when running in the Exos (probably because I don’t heel-strike), or when hiking downhill. My run was on a mix of ice and dry dirt. For most of the run I completely forgot I had the ExoSpikes on! The only time I really noticed them is when one of the heel studs would land on an embedded rock, and cant my ankle to one side. It felt like my foot landed off-camber, but did not make my ankle roll or anything major. I did notice some wear on the aluminum part of the studs after running on the mixed ice/dirt trail. The rubber underfoot still looks really good - I think they will last reasonably well even if I don't use them exclusively on ice and snow. I did have a couple of scary instances where my foot slipped on ice running down gradual hills in the ExoSpikes. I didn’t fall, but it definitely lowered my confidence running on ice. I wonder if the NanoSpikes, with fewer spikes, would do better on pure ice because each spike would dig deeper into the ice? But I am pretty certain that the Nanos would have worse toe-off slip when hiking because the studs are shorter and farther back from the toe. If I had a pair of shoes only for winter running, I think I would choose to just put studs in the outsole lugs. That could fix the toe-off slip, putting studs in the front toe lugs, and would be more comfortable running on dirt or rock on mixed trails. But since I don’t, I think the ExoSpikes are the best solution for running on ice and very hard packed snow - I just have to beware of those occasional slips. For hiking, I will use the MicroSpikes to avoid the unnerving slip during toe-off.