STABLE BUILD FOR HIGH-INTENSITY TRAINING. Men's Nike Metcon 3 Training Shoe features Flywire technology for a locked-down fit and a drop-in midsole for added stability. Its sticky rubber outsole enhances traction, providing you with a better grip during your workout. Flywire technology delivers a locked-down fit. Drop-in midsole provides a stable fit and feel. Embroidered TPU in high-wear areas enhances durability. Molded flex grooves in the forefoot allow for a natural flexibility. Firm rubber in the heel provides durability and a stable feel for high-intensity intervals. Low-profile heel clip rolls up on the lateral and medial sides to help minimize drag during wall exercises and handstand pushups.