| 摘要 |
An article of footwear provided with a ground engaging unit. The ground- engaging unit according to the present invention extends outwardly from a so le of the article of footwear, and has at least a portion that can be adjusted to present a varying height profile (i.e., a distance that the ground-engaging unit extends from the sole). The ground-engaging unit is preferably a single unit attached or otherwise fixed to the sole. It preferably includes a tip movably mounted on a base. The tip is selectively extendible or retractable with respect to the base. In one embodiment of the present invention, the ti p and the base are threadedly engaged, such that the height of the tip is adjustable by rotating the tip relative to the base between predetermined positions. A locking mechanism may also be provided to fix the tip and base in a particular relative relationship.
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