Inov-8 Men's F-Lite 235-M 100% Synthetic Imported Rubber sole For fitness workouts, weightlifting, and running Supreme stability: the power heel is 40% denser than the forefoot of the shoe, delivering maximum stability when lifting weights Natural flexibility: next generation meta-flex technology allows optimal multi-directional flexibility, while the met-cradle lacing system holds the foot secure. Both ensure the shoe moves naturally with the foot Unrivaled grip: the all-new 360 degree rope-Tec system extends onto the shoe's upper, delivering traction and durability on rope climbs Increased durability: the toe bumper has been reconstructed for ultimate protection against burpee fatigue