Shoe

A shoe comprising:

• a sole;
• and
• an upper surrounding an internal space configured to accommodate a foot, the upper having a toe portion and a heel portion,
• the upper including a first outer surface of an inner foot portion, and a plurality of first openings from which air is capable of being expelled from the internal space to outside of the shoe when the shoe swings, the plurality of first openings being defined on the first outer surface of the inner foot portion,
• the plurality of first openings being provided on a medial side of the shoe and being slanted by a first angle with respect to a vertical direction when the shoe is placed on a horizontal plane, and the plurality of first openings being recessed relative to the first outer surface,
• the upper including a second outer surface on an outer foot portion and defining a plurality of second openings configured to enable outside air to ventilate the internal space,
• the second outer surface being at an opposite side of the upper relative to the first outer surface, the plurality of second openings including at least one of:
• lateral openings being provided on a lateral side of the shoe and being slanted by a second angle with respect to the vertical direction, and cross openings extending from the medial side to the lateral side of the shoe,
• the plurality of second openings being recessed relative to the second outer surface, and
• the medial side of the shoe having a different appearance than the lateral side of the shoe.