If you like the arch support and style of the original Z1, don't buy the Zvolv. Yes they are noticeably lighter but they don't fit like my original chacos.
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Pros
The narrower straps were a bit longer but after I cut them off they fit perfectly and are now the shoes I wear most of the time.
Cons
I have two different sandals. Difficult to look at them properly because they are clearly different.