- PROFILE:Hyperdiamond Keystone GS is ideal if you're a young softball player who's looking for a supportive, versatile, low-cut cleat for all conditions. UPPER: Synthetic-leather upper with overlays throughout for lightweight durability and support. MIDSOLE: Full-length Phylon midsole for lightweight cushioning and comfort. OUTSOLE: Solid rubber outsole featuring FastFlex technology.
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