I use US shoe size 9-9.5 and medium fits perfectly. We went hiking on a gravel trail that was covered in ice (after rain) and then the top layer of snow thaws a bit creating an icy surface that was covered in slush/water. There were no problems climbing or descending the slope in conditions that would be dangerous for trail riding. Other hikers left the trail to find their way. After 3 miles the spikes showed no signs of wear even after a short walk in the parking lot and unfrozen trail. Rubber (it seems silicone) held the spikes in place and didn't slip.
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