A footwear system has a sole unit with a number of cavities formed between a midsole and an outsole. The cavities are complementary to one another to form groundward oriented air bulges in the outsole that are connected by a passage formed in the midsole. The passage permits movement of air between the cavities during use of the footwear system in a shoe.

 
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< Shoe sole and molds for makig the sole

< Sole construction for energy storage and rebound

> Engineered fabric with tightening channels

> Footwear closure system

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