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Made for fearless runners brave enough to take on the off-road terrain. Our FuelCell Summit Unknown features a Rock Stop Plate outsole to help protect feet on uneven ground, with Hydrohesion technology for superior grip. These women's running shoes have a bootie construction for a snug fit with Toe Protect technology and a gusseted tongue to guard against rocks and debris. A springy FuelCell midsole helps drive you forward.