Sock-like fit: The combination of the adaptive midsole and PRIMEKNIT upper creates a feeling of stepping into a stretchy, breathable and seamless sock that adapts to your foot shape and natural foot expansion. BOOST Upper: Boost offers endless energy in the mountains, temperature-independent cushioning and high adaptability on rocky surfaces. BOOST midsole: Boost offers long lasting cushioning, energy return and high adaptability on rocky surfaces. WATER REPELLENT PRIMEKNIT: splash water-repellent seamless primeknit upper providees ultimate fit through a precisely engineered, adaptive, lightweight knitted textile created in one step Abrasion resistant weldings: Protection. Continental Rubber outsole: Extraordinary traction in wet and dry conditions. EVA Stabilization frame: For lateral stability and mid-foot support. Upper: The outsole adapts to the ground to provide maximum traction on uneven terrain and soft ground.