Inov-8 Women's F-lite 250 Cross-Trainer Shoe 100% Synthetic Imported Synthetic sole Functional fitness workouts, performance training, weightlifting, running Explosive power: The Power heel is 40 percent denser than the forefoot of the shoe and with a 8mm heel-toe differential Explosive speed: The midfoot lockdown holds your foot secure to the sole ensuring the shoe will move fast with your every step Agility: Next generation Meta-flex technology and optimal multi-directional flexibility moves with the foot forward or laterally Unrivaled Grip: 360 degree Rope-tec system extended onto the shoe's upper delivers traction and durability on rope climbs