Made for fearless runners brave enough to take on the off-road terrain. The New Balance FuelCell Summit Unknown features a Rock Stop Plate outsole to help protect feet on uneven ground, with Hydrohesion technology for superior grip and synthetic upper material for durability. These women's trail 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. Meets New Balance's green leaf standard.