Brooks Mens Adrenaline GTS 14 Running Shoe White/Electric Blue/Silver Synthetic/Mesh Rubber sole Shaft measures approximately 2.27" from arch Synthetic Brooks DNA Cushioning Technology - this ground breaking cushioning technology automatically and physically adapts with each foot strike to provide the optimal balance of cushioning and stability personalized for each runner and each step Rubber sole Brooks BioMogo - the first-ever biodegradeable running shoe midsole; our non-toxic, natural additive to the midsole enables it to biodegrade 50x faster than other midsoles without changing the performance or useful life of the shoe. This eco-friendly technology won Runner's World International "Best Innovation" Award in 2006 The Adrenaline GTS 14 is the creme de la creme of support, cushion, and balance.