The Altra Lone Peak 9 GTX is the wet-weather version of the trail shoe that thru-hikers and long-run regulars already know, built for the days when the trail is soaked before the run even starts. The GORE-TEX Invisible Fit upper bonds the membrane directly to the 85% rPET upper material, keeping the fit close and the weight penalty to just 0. 7 ounces over the standard Lone Peak 9. On creek crossings and shoulder-season routes where the trail stays wet for miles, the EGO midsole and MaxTrac outsole work together to keep the foot stable and the stride natural. What Our Gearhead(R) Experts Are Saying:"The GORE-TEX Invisible Fit membrane keeps my feet dry on creek crossings and wet-morning trail runs without the stiff feel that kills the zero-drop ride."