Go out in nature and explore with the New Balance FuelCell Summit Unknown v4. With exceptional grip and traction the Summit Unknown lets you run confidently in wet or dry conditions. The bootie-style upper gives you a supportive fit, while plenty of energetic cushion keeps you running strong. Whether you are doing a trail workout, racing or just want to run fast, the Summit Unknown will be your go-to shoe. Details Upper: A bootie-style upper with synthetic mesh gives you plenty of breathability and a supportive fit. There is Toe Protect technology that helps protect your feet from rocks, roots and other trail debris. Midsole: New Balance’s FuelCell midsole gives you a bouncy, propulsive feet that drives you forward. The FuelCell material is made from approximately 3% bio-based content that is made from renewable resources that help to reduce your carbon footprint. Outsole: A Rock Stop Plate outsole protects the bottom of your feet and disperses pressure on rocky, uneven terrain. The Hydrohesion rubber outsole has aggressive lugs that give you grip in wet conditions.