The updated version of Saucony's Guide, version 17 is a fully upgrade from it's predecessor (Guide 16). The Guide 17 has the an even softer flexible feel of the 16 and added stability with a larger footprint that you want for those long runs. A fantastic shoe for any distance. A bit more structure has been added to the upper around your foot. Soft PWRRUN cushioning. A carved out midsole allows your feet to sit deeper inside the shoe provided stability from both sides. A slight rocker to the shoe also provides a smoother transition from heel to toe! Specs Category Stability Drop/Stack height 6mm (35/29) Weight 232g FAQ’s & Reviews How long will the shoe last? Saucony claim their cushioning will last 400 miles. The life of the shoe varies from user to user due to characteristics of running style and terrain. Honestly, you likely will get more than that.