X521M - Men's runner
- Open air sandwich mesh upper
- Tri-density compression sculpted midsole
- Contrex external stability enhancer
- Carboplast footbridge for motion control
- Lenex Last: Straight last, snug rearfoot and forefoot freedom
- Mozaic: pressure relief insole for customized comfort
- Removable Inserts: 2 removable layers for fitting flexibility
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