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I worked shoe repair for 7 years, and we sold more vibram soles then anything, hell my Danners have vibram soles and they are 6 years old and have very little wear. Only problem I found with vibram rubber soles compaired to their softer poro soles is when they get below -10 they dont grip with shit, but the poro soles do grip at cooler temps but wear down faster casue they are a spongue type rubber.
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