STABLE BUILD FOR HIGH-INTENSITY TRAINING. Women's Nike Metcon 3 Training Shoe features Flywire technology for a locked-down fit and a drop-in midsole for added stability. The outsole has sticky rubber in the forefoot for added traction while you perform quick cuts. Flywire technology integrates into the laces at the midfoot for a dynamic fit that helps lock your foot in place without restricting natural movement. Dual-density, drop-in midsole is firmer in the heel to handle the rigours of lifting, yet softer and more flexible in the forefoot to provide comfort and cushioning for your footstrike when running. Embroidered TPU in high-wear areas enhances durability. Perforated vamp enhances ventilation for comfort. Firm rubber in the heel provides durable stability for high-intensity intervals.