The NOVABLAST™ 4 LE running shoe features a midsole and outsole geometry that helps produce an energized ride. A tongue wing construction in the upper helps improve the fit while reducing tongue movement. It's complemented with an engineered jacquard upper that offers more stretch, ventilation, and durability. FF BLAST™ PLUS ECO cushioning is made with approximately 24% bio-based content. This material helps create softer landings and a more energized toe-off during your training.