Not worth it
Was excited about getting this shoe cover since it blocks the wind at a decent price. I got the size L for a size 43 shoe. Unfortunately when I received it, I had a really tough time putting it on the shoe -- Mavic made the rear zip very small ,and didn't think about how hard it would be to put on shoe covers on bike shoes with speedplay cleats. Returned it because (1) I didn't want risk ripping the shoe cover while putting it on since it was such a tight fit, and (2) I don't want to spend 5 minutes putting on the shoe cover every time the weather's cold enough for it.