Reach for the Sky 6 when you want a lightweight choice that fits even better thanks to the improved upper made from recycled materials. MIZUNO ENERZY CORE: New advanced midsole material, delivering the most resiliency and softness. It improves comfort and adds spring to drive optimum performance. MIZUNO ENERZY (FOAM): Offering versatility in its application, while still maintaining softness and resilience.  It will help enhance performance capabilities. MIZUNO WAVE®: The MIZUNO WAVE® plate disperses energy from impact to a broader area providing a stable platform and a superior cushioning. X10 Outsole: Durable carbon rubber that allows for longer wear. Stretch Woven Upper