Saucony has provided runners with a top of the line trail running shoe in the Xodus ISO Runshield. Now enhanced with ISOFIT system, runners can achieve a more personalized and adaptive fit. The upper has also been updated with the ultra-protective FLEXSHELL with DWR to shield against the elements on the run. Traction has been improved even further with a PWRTRAC rubber that gives runners better traction than other rubber materials used in the past. Trail runners can be confident with this model as the ultimate tool to take on the most rugged terrain on their next run. Upper: FLEXSHELL upper with DWR treatment provides protection against the elements. ISOFIT provides a dynamic fit system to natural foot movement. RUNDRY lining wicks away moisture to keep feet dry. Internal gusset construction keeps debris out. Midsole: EVERUNheel Insert provides a lively, resilient ride while providing continuous cushioning and enhanced energy return properties. 4mm offset enhances balance on uneven terrain. Removable insole.Outsole: Aggressive lug design provides excellent traction and easy cleaning after muddy runs. PWRTRAC Rubber provides 3x better traction that standard rubber.