Footgear sole and sandal

A sole of footgear, including a heel portion and a ground plane, said sole being formed of a material with resiliency, and having a uniform thickness over an entire area thereof inclusive of said heel portion, comprising:

• an incision or a groove formed in said ground plane and arranged along a first straight line extending via one point present in an area in said ground plane, in a longitudinal direction of said footgear, said area corresponding to an arch of a foot of a wearer;
• a plurality of incisions or a plurality of grooves formed in said ground plane and arranged along segments defining a plurality of similar quadrilaterals each having two corners thereof placed on said first straight line, in a manner being opposed to each other across said one point, and another two corners thereof placed on a second straight line present in an assumed plane including said ground plane and orthogonal to said first straight line via said one point, in a manner being opposed to each other across said one point;
• and
• at least one incision or at least one groove formed in said ground plane and arranged along at least one straight line other than said first straight line extending in parallel with the same.