Sole series and method for manufacturing sole

A sole series comprising:

• a plurality of soles having different shapes each including a midsole that extends from a heel region to a toe region and has an upper surface that serves as a sole supporting surface that supports a sole of a foot of a shoe wearer,
• wherein
• each of the midsoles of the plurality of soles includes
• an upper midsole that extends from the heel region to the toe region and is formed of an elastic material,
• a lower midsole having an upper surface that extends along a lower surface of the upper midsole, extends from the heel region to the toe region, and is formed of an elastic material, and
• in each of the soles,
• when a position of a rearmost end on the sole supporting surface is P0,
• a position of a foremost end on the sole supporting surface is P100,
• a straight line connecting the position PO and the position P100 is Ls,
• a curved line connecting the position PO and the position P100 and extending along the sole supporting surface is Lc,
• a length of a curved line Lc is L,
• a position at a distance of 0.15 L from the position P0 on the curved line Lc is P15,
• a position at a distance of 0.45 L from the position P0 on the curved line Lc is P45,
• a position at a distance of 0.68 L from the position P0 on the curved line Lc is P68,
• an intersection of a straight line passing through the position P45 and being orthogonal to the straight line Ls and a lower surface is C, and
• a straight line connecting the position 15 and the position P68 is T,
• each of the plurality of soles is configured such that, in a non-wearing state, while the sole contacts ground at the intersection C, the heel region does not contact the ground,
• the upper midsoles of the plurality of soles are formed to have the same shape, and
• the lower midsoles of the plurality of soles are formed to have different shapes such that an angle between the straight line T and the ground is a forwardly descending angle that differs between the plurality of soles.