Article of footwear with perforated covering and removable components

An article configured to be placed on the foot of a human wearer, comprising:

• a one-piece flexible outer cover shaped to envelope substantially all of the foot below the ankle of the wearer, the cover being formed of an elastomeric material and including:
• a sole region having opposing inner and outer surfaces, the inner surface positioned to face the sole of the foot,
• an upper region attached to the sole region and positioned to cover at least a portion of the top and sides of the foot, and
• a plurality of apertures formed in the sole region and upper region, wherein each of the plurality of apertures form a generally open area sized between 5.0 mm and 15.0 mm wide;
• a removable outsole nested within the cover and including:
• opposing upper and lower surfaces, the lower surface facing the inner sole region surface, and
• a plurality of lugs on the lower surface protruding into a portion of the plurality of apertures formed throughout the sole region;
• and
• a removable slipper nested within the cover and having a sole and an upper, the slipper sole facing the upper outsole surface.