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Zappos.com is proud to offer the New Balance - MD506 (Black/Red) - Footwear: This fun and funky track spike is perfect for multiple events from sprints to distance to jumps. ; Breathable mesh upper in a fun design. ; C-CAP® lightweight, compression-molded EVA midsole provides cushioning and flexibility. ; N-LOCK® integrated lacing and webbing system delivers the optimal fit, support and security. ; Seven-spike configuration. ; Removable spikes. ; Built on an RL-2 last. ; 8.00 oz. ; Product measurements were taken using size Men's 8.5, Women's 10. Please note that measurements may vary by size.