Providing the ultimate in weight, cushioning and traction for distance athletes competing at 3,000 to 10,000 meters. Ultra-lightweight breathable mesh upper with Pebax injected support straps and minimal synthetic overlays, lobe foam technology for secure fit. Phylon midsole with heel Zoom Air unit. Dual-density full-length plate with four permanent steel spikes and injected TPU sharkskin inserts. For use on rubber tracks only. 4.8 oz.