I rarely post reviews, but do in this case because the shoes caused me to bleed in the area of my Achilles' tendon.  I have used Teva shoes for years, always satisfied.  These, however, are rigid at the back of my Achilles' tendon to the point that after hiking for about 3 hours in rather flat (but not always) terrain I found my socks bloodied, not horribly so, but noticeably.  The problem is that the back of the shoe is quite rigid.  I dislike returning things, so will try these once more with double socks; if that removes the attrition I will keep them, for I do like the other features of this shoe and Teva generally.  I need a little more ankle support than most, so go for something in between a low back fit and very high fit (the latter limiting foot pivot mobility).  This shoe is in that in between, but is so rigid in the back to cause the bleeding.