I bought these last year at the very end of the snowy season, because I had fallen while shoveling my steep asphalt driveway.  I hadn't had the need to use them until this season.  They work very well, in terms of giving secure traction in icy conditions.  However, I've thus far lost 5 cleats -- where they went, I don't know.  They came off during use.  I see that the vendor is now shipping with extra cleats.  Good idea;  you'll need them.  I don't think they were shipping with extra cleats when I bought my pair.  I have no extra cleats.  The other deficiency is that they tend to shift in use, with soles sliding towards the inside of the foot.  All things considered, I'm going to be trying some alternative brands/designs.  With so many cleats missing, these are now throw-aways.