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Zappos.com is proud to offer the Pearl Izumi - SyncroFuel (Shadow Grey/Silver) - Footwear: Add the SyncroFuel to the fire and burn bright mile after mile! ; Seamless race upper with hybrid mesh; features a combination of 100% recycled polyester mid-foot mesh and breathable forefoot mesh. ; Integrated 360° lacing system for a secure fit. ; Half length medial side syncro stability frame. ; High Rebound SKYDEX forefoot propulsion pad for long lasting cushioning. ; Segmented forefoot for a natural and soft strike. ; Dual density EVA insole for increased arch support. ; Midfoot TPU bridge for added arch support. ; Forefoot Flex Grooves deliver a smooth and efficient ride. ; Full blown rubber forefoot outsole with carbon rubber heel crash pad. ; 360° degree reflectivity. ; Heel to toe offset 11mm. ; 11.00 oz. ; Product measurements were taken using size 7.5. Please note that measurements may vary by size.