Sole structure with midsole protrusions and arced profile for forward momentum

A sole structure for an article of footwear, the sole structure comprising:

• a midsole having a ground-facing surface with a forefoot region, a midfoot region, and a heel region, the midsole defining downwardly-extending protrusions at the ground-facing surface distributed over the midfoot region and the heel region, each of the downwardly-extending protrusions having a convex outer surface;
• wherein a height of the midsole from a foot-facing surface of the midsole on which a foot rests to the ground-facing surface of the midsole is greatest at the midfoot region such that a height of the midsole in the heel region from the foot-facing surface to the ground-facing surface is less than the height of the midsole in the midfoot region;
• an outsole including a first outsole portion covering the ground-facing surface of the midsole in the forefoot region, a second outsole portion covering the ground-facing surface of the midsole in the heel region, and a third outsole portion covering the ground-facing surface of the midsole in the midfoot region;
• wherein the first outsole portion and the third outsole portion are at least partially separated by a first gap extending between a medial edge and a lateral edge of the midsole;
• the second outsole portion and the third outsole portion are at least partially separated by a second gap extending between the medial edge and the lateral edge of the midsole;
• the midsole includes a first ridge that extends into and at least partially fills the first gap;
• and
• the midsole includes a second ridge that extends into and at least partially fills the second gap.