Specs
At 257g (9.06oz) in my size US 11, the Vanish Carbon is quite heavier compared to other supershoes. Of course the zero drop feature adds some midsole in the forefoot (33mm stack) and there is a rather thick outsole in this shoe. And while weight is not the number one criterion, it’s still a nice comparison point – not playing in favor of the Vanish carbon in this specific case.
The platform is wide like one would expect from an Altra shoe. For specific values, please check the Shoe Comparator in which you can compare the width for the forefoot, midfoot and heel against other shoes.
Upper
The upper is very thin and composed of two distinct parts: the black plasticky material in the heel and the red engineered mesh in the midfoot and forefoot. The black part is thicker and has more structure to it, providing with a nice heel lockdown and comfort. I’m more skeptical with respect to the forefoot. That red mesh does not feel super sturdy nor qualitative. Plus it is very unstructured, which compromised the lockdown for me in the midfoot. As you’d expect the forefoot is pretty wide, although Altra connoisseurs will probably rate it slimmer than on other iconic models of the brand.
One issue I noticed fairly quickly in my testing: the tip of the forefoot comes with a plastic underlay that is glued to the upper from the inside. It is meant to bring some structure and avoid having the upper collapse too much on your toes. This piece of plastic detached and came against my toes while running, which was unpleasant. I removed the shoe and put it under the insole (but the upper was then really collapsing on my toes). Altra confirmed this issue was solved on production pairs.