The Brooks Adrenaline GTS 21 features an extended DNA LOFT from the heel to forefoot for a buttery smooth stride. The GuideRails® on both sides of the heel continue to work like bumpers on a bowling alley that keeps your foot towards the middle of the shoe where your stride is most efficient.  More DNA Loft cushioning that extends throughout the midsole for a smoother transition from heel to toe. In great pre-owned conditions. Sings of wear on the sole, minimal sings of wear around the shoes. **FLAWS** Missing insoles please see all pictures! Size 8.5 (True to size) New Engineered Air Mesh upper hugs foot for a secure fit while also improving breathability.