| 摘要 |
An article of footwear (10) having an initial contact portion (30) and a med ial/forefoot portion (34). The initial contact portion ( 30) exterior sole surface is formed at a dihedral angle (38) to the sole surface of the medial/forefoot portion (34) such that the heel portion has a minimal thickness of material interposed between the foot (32) and the gro und surface (40) at a postero-lateral edge of the sole s tructure, which means that foot flight continues until the foot moves closer to the gr ound (40) to delay impact and increase stride length. A high friction interface (72, 172) is provided in a medial/forefoot portion of a s hoe insole and low friction interface (74, 174) is provi ded at the initial contact portion (30) of the shoe insole. The low friction area (72) reduces sharing on foot impact, and the high friction fo refoot interface (72, 172) eliminates sliding of the forefoot during foot push-off, to decrease wasted energy. Energy efficient and stride length increase are achieved.
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