- Rubber sole Energy Blade Trail running: Energy Blade is a lightweight TPU plate built into the springy midsoles. Thanks to a unique synergy with the midsole foam and geometry, it activates forward propulsion and ensures smooth, stable transitions in all trail conditions. Fuze Surge: Made up of one of our softest EVA compounds and 30% natural rubber, Fuze Surge foam is pillowy for instant comfort and responsive enough to keep rebound levels high. Engineered using less artificial polymers, this midsole compound delivers a more earth-conscious, smooth yet dynamic stride. Reverse Camber: Inspired by Salomon's ski heritage, this curved midsole geometry helps you feel like you are floating over the ground.