In reply to John Kelly:
I used Mudrocs for years, and overall found that they started off with the best grip I’ve yet come across. I’ve recently switched to La Sportiva Mutants, as I found that Inov8s in general were falling apart quicker, and the grip relied on the protruding soft studs, of which key ones would split off far too soon.
The Mutants have not quite as good grip, particularly on mud, hard packed greasy soil and gravel, worst on steep uphills, but seem substantially more durable so far.