Why They're CoolThe ZG 20s' tall all-leather uppers, huge wraparound toe rands, and stiff Vibram soles made these bomber boots a good fit for off-route cross-country rambling. » Scarpa's oh-so-firm polyurethane midsole and nylon insole gave me the ridge-leaping powers of a mountain goat. I clung to hillsides as if I had hooves. This Vibram sticks, and the uppers kept my ankles aligned. » Synthetic lower lace eyelets cinch easily and don't catch debris. » With all this off-piste capability, on-trail hiking is a cinch with day loads or a backpack. I tried 40 pounds and could have pushed it another ten, I'm sure.Hmmm . . .With high, all-leather uppers, this can be a warm boot. Make sure the ZG 20s fit not only your feet, but also your climate.