Reduced seams, less weight and a smoother ride tell the story of the updated Brooks PureFlow 4 running shoes. The wider NAV Band provides even more arch support and a locked-in fit so that you'll feel more secure with every step you take. These lightweight shoes still boast plenty of cushion and comfort. Ideal for neutral runners on the road or track.Upper: NAV Band locks into the medial eye row and wraps over the instep to provide a comfortable arch support without underfoot bulk. Padded heel collar enhances comfort. Lace-up front provides an adjustable fit. Mesh enhances breathable flexibility.Midsole: BioMoGo DNA midsole blends earth-friendly foam with adaptable DNA cushioning. Omega Grooves, Tuned Density Midsole better corresponds with gender and weight categories to deliver custom balance of cushioning that's not too soft or stiff. Anatomical Last is designed from an anatomical form to contour the foot for a glove-like feel and provide support for every part of the foot.Outsole: Rounded Heel aligns force through the center of the ankle joint, reducing internal stress on the body. Toe Flex allows the big to toe function independently and engage natural balance.