Women's Nike Free Metcon 6 Training Shoe - Black - Low-top sneakers Engineered to keep you cool as your workouts heat up, this training shoe sports a lightweight mesh upper that is extremely breathable. Signature Flywire cables link the lacing to the sole for reliable, responsive lockdown. It sits on laser-siped, dual-density foam that's firmer at the heel for a secure, stable fit and softer under the forefoot for high-impact cushioning. An optional Hyperlift insert under the heel fits all Metcon shoes and promotes optimal form for squats, wall balls and thrusters. The laser-siped, flexible outsole wraps up both sides to give you multidirectional grip for climbing ropes, pushing sleds or sprinting through circuits.