Other reviews said it's very slippery on any surface. So were mine. I could literally slide across the wooden floor like it was ice. Presumably the Scotchguard was also sprayed on the ground. I just stood on the concrete pavement and spun my feet to wipe off the spatter... problem solved and now I don't slip anymore. Very comfortable and for the price. I wear a fixed size 11.5 and they fit great.
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