About this item Fresh Foam X midsole foam with approximately 3% bio-based content delivers our most cushioned Fresh Foam experience for incredible comfort. Bio-based content is made from renewable resources to help reduce our carbon footprint NDurance rubber outsole technology provides superior durability in high-wear areas to help get more out of these running shoes Engineered air mesh upper Reflective accents designed to catch the light 6 mm drop; due to variances created during the development and manufacturing processes, all references to 6 mm drop are approximate Description If we only made one running shoe, it would be the Fresh Foam X 1080. The unique combination of reliable comfort and high performance offers versatility that spans everyday to race day. The Fresh Foam X midsole cushioning is built for smooth transitions from landing to push-off, while a second-skin style mesh upper is breathable and supportive.