High alpine runs? Ultra training? You name it. The Proton is a cool, durable, high-mileage shoe is a must in your quiver. Rely on the dual-density EVA midsole for cushioning (10mm drop) and the heel cage for stability. The fabric-synthetic leather upper breathes well and resists abrasion. Up front, lightweight toe protection lets you run and hike the gnarliest trails without sacrificing your feet.