Vivobarefoot Breathable mesh upper with seamless synthetic overlays Soft and breathable textile microfibre lining Removable 3mm thin Performance insole Ultra-thin, flexible and foldable The Primus Trail II Firm Ground is our original, best-selling trail-running sneaker. It’s light, durable and flexible for wide-ranging trail adventures that bring you closer to the earth. Continuously improved through athlete testing and material innovation, the Primus Trail II FG has nothing more or less than exactly what you need – made with high-performance, recycled, vegan* materials. First and foremost a trail runner, the Primus Trail II FG also excels at fastpacking and hiking. Its low profile even makes it popular for outdoor-forward city lifestyles, including HIIT workouts and strength training. The wide, thin, flexible build offers supreme sensitivity and natural mobility on uneven ground. The quick-lace system allows for fast on-off and easy adjustments. And the Firm Ground sole balances sensitivity, grip and spee