NIKE Mens Sock Dart Running Shoes Medium Grey/Black/White 819686-002 Size 9 synthetic-and-mesh Rubber sole Flexible, breathable mesh helps keep your feet cool and comfortable, while the molded midfoot strap with adjustable closure provides a personalized fit. Full-length Phylon foam underneath your foot offers lasting, cushioned comfort. Rubber outsole and BRS 1000 heel for enhanced durability Flex grooves let your feet move naturally Compression-molded Phylon foam offers lightweight cushioning