Consider to make clear, if reduce shoe weight 1 gram, be equivalent to subtracting in the person's back 6 grams weight.

研究表明，若将鞋子重量减轻1克，就相当于在人的背部减去6克重量。

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They're also driven by improvements in manufacturing processes that would be lowering shoe weight regardless of whether models like the FiveFingers had ever become popular.

制作过程的改进也让鞋子的重量得以减轻，不管五指鞋是不是流行。

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For humans to distribute their weight widely enough to not break the water's surface tension, each shoe would have to be several times larger than a football field, Lauga explained.

Lauga解释道，因为如果要让人类体重足够分散而不至于超过水的表面张力的话，每只鞋子的面积必须比足球场大数倍。

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And for those suffering from obesity, sporting the unstructured shoe can add strain to feet that are already stressed with carrying extra weight.

CNN: Flip-flops present feet with a painful problem

"If someone were to drop a weight on their toe, and they don't have their shoe on, their toe is going to explode, " says Jason Carrell, the operator of Fitness 19 in Royal Oak, Mich.

WSJ: Barefoot Jocks Keep Gym Members on Their Toes