Design: Engineered mesh upper for a comfortable, breathable fit Nitrogen-infused DNA FLASH v2 cushioning is softer, lighter, and nearly 10% more responsive than before to help you run fast Lightweight, quick, and cushioned to power any run, gym session, and more In-Shoe Comfort: DNA FLASH v2 delivers nearly 10% more energy return and is lighter than the previous version Increased stack heights by 4 mm in the forefoot and 4 mm in the heel GuideRails holistic support system supports your body in its natural motion path while keeping excess movement in check Durability & Traction: RoadTack Rubber is made with recycled materials and offers lightweight durability and rebound Additional Details: Made with recycled materials equivalent to 6 plastic water bottles