There is an off-leash dog park here in Maplewood Minnesota that is quite popular, but the heavy traffic and the early spring snow/thaw/refreeze cycle makes the main paths in the park nearly unwalkable, especially the hilly parts. These work exceptionally well, I was completely at ease walking up and down even the steepest parts of the paths. I bought the XXL size and used them on size 12 tennis shoes, they were still a bit tight. Not uncomfortable, but noticeable, but the sure footing more than makes up for it.

Living in Minnesota, when I walk our dogs I encounter more than my share of ice. I needed something that firmly grips the ice, but also works when I drive the dogs to the dog park and when I am walking on pavement. As such, I could not be more satisfied with my choice of the Uelfbaby Crampons Spikes Ice Snow Grips Traction Cleats System.
First, the size chart is accurate. I bought a pair for myself and my wife and both fit our boots to perfection. After stretching them onto our boots, the cleats stay in place and do not shift. Walking uphill or downhill, I have yet to lose any traction.
Nothing lasts forever, so I promptly ordered a second pair. However, I have a feeling that since these are so well made, I will have that second pair in reserve for years to come, or so I hope.

Edit: (((Amazon, why can't we award half stars, for crying out loud!!)))
I have worn these on about ten more icy and snowy hikes. These are essential kit and so cheap you can't go wrong. I felt bad watching a couple people slide down an ice-covered rockfall the other day while I was safely planted in the same ice with these babies"”be prepared.

Original review:
I have only worn these ice cleats on a couple snowy, icy hikes. They are replacing true Kahtoola Microspikes that are very dull that I had worn the last four winters in the Boulder Flatirons. Several years ago I also got about 3 seasons out of a knockoff pair, which I thought was great, so I had no trepidation trying this brand out. They did come with a bag and Velcro straps that I have not used.

I first wore these ice cleats in wet, slushy snow with not much ice. They frequently packed up with snow, but I believe it just wasn't a good day for any ice cleats. My XLs fit well on my 10.5 NorthFace winter boots (the kind with the rubber insulation around the forefoot). Large may have worked, as well, with some extra pulling.

My next outing was on much more ice, and the cleats worked great! I wore them over 10.5 Gtx Saucony Excursion trail runners, and they fit pretty well. The Excursions' toe is a little soft, so the ice cleats were not extremely comfortable by the end of my hike. I'll wear trail runners with a burlier toe box next time. The 19 teeth per foot (only 12 on Microspikes) really dug into the smooth, melting ice going up and down the trail. I believe that the larger teeth on these (some larger, some smaller depending on where they are located) were bigger than Microspike teeth. The small metal bar at the toe served its purpose but does not work as well as the rubber configuration on true Microspikes. There was a little play on the bottom of my foot"”chains not extremely tight on my trail runners. But there was no issue at all with performance, comfort, or my confidence on wet smooth ice. Of course these cost less than a third the price of the big name brand, so any small negatives are more than a fair trade. These ice cleats don't seem to weigh much more than Microspikes. Although they are visibly bigger than the Kahtoolas, they fit in the Kahtoola bag. I probably could have gone with L, but these XLs have worked for my big boots, and I feel L would have pulled my softer trail runners out of shape. My beefier Addidas Terrex should be a good match for them, structurally.

I'll keep my eye on Kahtoola Microspike prices (they really can't be beat, and I got my last pair for about $50; $75 is pretty steep), but I am in no hurry to trade up from these very very good ice cleats.

Fit my size 13 Vasque Sundowners. The eyes where the chain fits on the rubber do not appear to have additional reinforcement. Made in China

Great product definitely helped with my Teewinot Climb but did break (clasp) one side only on way down on rock.