Shoe sole and shoe for midfoot striker
The present invention provides an improved shoe sole for a running shoe conducive to a midfoot striking gait including a cushioning element positioned between the upper surface and the ground-contacting surface, at least a portion of which is positioned on a lateral side of the sole and contained within a region between 15% and 90% of the length of the shoe sole as measured from a rearfoot end of the sole. One or more high abrasion-resistant ground-contacting crash pads are positioned below the cushioning element, and include a lateral side portion contained within a region extending a distance of 20% the length of the shoe sole, as measured from a rearfoot end of the shoe sole. The shoe sole, preferably devoid of at least vertical arch sculpting, also includes a longitudinal flex groove positioned just medial of the crash pads.
1. A shoe sole for a running shoe, comprising:
a midsole layer extending a length and width of the shoe sole and comprising an upper surface positionable proximate an insole and a lower surface;
a unitary cushioning element positioned below and abutting a midfoot region of the lower surface of the midsole layer on a lateral side of the shoe sole, wherein a width of the unitary cushioning element is no more than half a transverse width of the shoe sole and wherein at least a portion of the cushioning element is positioned within a region between 20% and 90% of the length of said shoe sole as measured from a rearfoot end of said shoe sole;
a ground-contacting surface comprising:
(a) one or more crash pads positioned below the cushioning element, the width of the one or more crash pads being less than half the transverse width of the shoe sole; and
(b) an outsole layer positioned below and abutting the lower surface of the midsole layer over at least a portion of the heel region, the forefoot region, and a medial side of the midfoot region of the shoe sole; and
a longitudinal flex groove, the flex groove separating the one or more crash pads from a medial side portion of the outsole layer.
2. The shoe sole of claim 1 , wherein the cushioning element is positioned only on said lateral side within a region located between 20% and 70% of the length of said shoe sole as measured from said rearfoot end.
3. The shoe sole of claim 1 , wherein the cushioning element further includes a medially extended portion in a forefoot region which covers the metatarsal head area of the foot.
4. The shoe sole of claim 1 , wherein a difference in thickness between the midsole layer in a rearfoot region and that in a forefoot region is less than 10 mm.
5. The shoe sole of claim 1 , wherein the longitudinal flex groove extends over between 80% and 90% of the length of the shoe sole.
6. The shoe sole of claim 1 , wherein the one or more ground-contacting crash pads comprise at least one of a high abrasion-resistant engineered rubber, a foam rubber, and a sticky blown rubber.