- UPPER: FlyMesh Upper with Dynamic Fit midfoot lockdown system for a great and secure fit. MIDSOLE: Dual Density Phylon/Cushlon midsole with forefoot Zoom Air unit, features dynamic support for pronation support. OUTSOLE: Iconic crash rail helps with initial impact and smooth transition, whilst our new outsole pattern enhances traction. PROFILE: The ST20 masters stability with a smooth transition and ride.
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