Engineered knit upper: A lightweight, breathable knit material that reduces the need for additional overlays. PureGEL technology: Softer, updated version of our GEL technology that maintains all the acclaimed properties that have made GEL technology famous.  Approximately 65% softer vs standard GEL technology. FF BLAST PLUS cushioning: Midsole foam that provides a blend of cloud like cushioning and a responsive ride that is lighter than FF BLAST. OrthoLite X-55 sockliner: Premium sockliner that provides cushioning performance and moisture management for a cooler, dryer environment. Reflective details: Visibility for enhanced nightime and early-morning reflective brightness.