However, if you're running on trails where the snow is a bit deeper, and you need to dig deep for more traction, you won't be able to find a better option than the Kahtoola MICROspikes (https://kahtoola.com/product/microspikes/). The nice folks at Kahtoola sent me a pair a few months ago to test, but since we haven't had much snow so far this winter, up until the past week I hadn't been able to use them. Finally, we got a bit of snow, so last weekend I headed up to my favourite local trail loop to try them out. Conditions for testing were perfect- we'd had a couple of inches of snow, which had been trampled down, then it warmed up enough to make the trails wet and slushy, and then got really cold, so the trampled snow was frozen solid, and then some more fresh snow on top of that, so it was very slippery. Regular trail shoes definitely weren't enough to dig through and give the traction I needed, so the MICROspikes got pulled out. The first trial run was with my daughter, so it was a nice easy pace around the loop, just to get a sense of how much traction I could get. I felt very secure- no slipping at all, so I decided to come back again the next morning by myself to try for the Strava Course Record on that loop. Normally, if you're going for a course record, you pick a day when the trails are dry, not mushy and slippery, but I figured what better way to put these things through their paces than to go as hard as I could. The loop has a couple of good climbs- one of them fairly long, with a couple of short, steep sections (18% grade), and with the MICROspikes I had no problem clawing my way up those bits. It also has a couple of steep downhills, with sharp corners in the middle of the descents, which can really test your traction. If you're going downhill fast, try to turn, and lose your traction, you end up in the rhubarb (as they say here in Canada) pretty darn quick. I was able let gravity do its thing, and go as fast as my legs would turn over, and all was good- no issues at all with traction. I ended up taking about 15 seconds off the course record, which I'd set several weeks earlier when the trails were bone dry. I figure that if I could take the CR in those conditions, then that says a lot for this product.
The MICROspikes have a silicon boot sort of thing that slides on over your shoes, and provided you get the correct size, works really well. The ones I have don't feel sloppy, or too tight- you don't really feel them at all.
In summary, if you need mega traction in your arsenal of winter running gear, then Kahtoola MICROspikes are the way to go.