This blog is written by author Sachiko who is not a native speaker of English, so it may be hard to read. It is translated from the summary of Japanese page; http://akitaodatelifejp.hatenablog.com/

Boots of "Mitsuuma" brand

This shoes maker is at Otaru city, Hokkaido where is the northernmost of Japan and heavy snow area.

I think they are non-slip, in fact, I have fallen down only two times in two years.

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The information is as of November 21th 2017.