Amazon.com: Nike Flex 2019 RN - Tenis de correr para hombre 。NIKE FLEX RN 2019 The Nike Flex RN 2019 is a running shoe that is designed to work with your body, from the upper that stretches with your foot as it heats up, to the midsole that flexes though your stride. Using a stretchable knit upper to wrap your foot, the Nike Flex RN 2019 expands and contracts along with your foot to provide comfort for the full length of your run. A dual density foam provides cushioned comfort, while flex grooves cut across the foam allow the outsole to move and bend for high heel to toe flexibility. Synthetic overlays around the laces provide the lock down needed for a secure fit and a heel strap stabilises the back of the foot, without hindering natural movement. REGULAR CUSHIONING Regular cushioning offers a blend of lightness, comfort, and ground feel. Popular for shorter distance racing as well as training and daily mileage running, the lower stack of midsole foam offers inherent stability and a lighter feel on your foot when compared to max-stack shoes. NEUTRAL Neutral running shoes are designed to provide a smooth sensation without correcting your gait. They allow your natural motion to flow, while still offering a snug fit and a cushioned feel underfoot. As such, they’re ideal for runners who don’t overpronate.