The NOVABLAST 4 Offers our most energized ride yet with premium FF BLAST™ PLUS cushioning and botanical geometries to produce a bounce effect with a springy feel underfoot, Engineered woven upper offers more stretch, ventilation, durability and overall comfort, A tongue wing construction with added stretch helps improve the fit while reducing tongue movement, FF BLAST™ PLUS ECO cushioning is made with 20% recycled bio content. This foam encourages softer landings and a more energized toe-off during your training, Trampoline constructed outsole, modified toe spring, layered geometric midsole and nested heel combine for improved bounce, acceleration, smoother transition and added stability