The brand's assertion is that companies are too focused on the CO2 consumption of a shoe individually when it is actually the CO2 savings by simply consuming - thereby producing - fewer shoes that is more impactful.
Though its public report doesn't currently reveal factors like whether the 511 testers were compensated or provided shoes for free - not to mention some intangibles like were they more likely to report positively/less negatively based on being a fan of the brand - the study says that the runners' weight...
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