A shoe having an open interior, a plate positioned between the bottom of the shoe and a portion of the upper, and at least one opening extending from the bottom of the shoe into the midsole for providing air communication with the interior of the upper. In one embodiment, the opening has a height as measured from the bottom of the shoe along a vertical central axis that is greater than one-half the thickness of the rear sole. In another embodiment, the opening extends through the plate.

 
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> Helium injected footwear with adjustable shoe size upper and adjustable firmness sole

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