From the official Asics' Amazon store's description of this item:

• Materials are synthetic and mesh
• Gel technology provides cushioning and shock absorption
• The AmpliFoam midsole provides added flexibility, comfort and platform adaptability
• "The SL iteration also incorporates an wide fit design to accommodate the needs of those with more volume in their feet. The GEL-CONTEND 5 SL (Wide) shoe offers a supportive fit thanks to an internal heel counter, while rearfoot GEL technology and the AMPLIFOAM midsole help your feet remain cushioned and comfortable."

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