adidas Performance Adizero Javelin 2 Athletics Field Event Spikes - Yellow Coolever Lining - Uses clover-shaped yarn to manage heat and sweat. Welded, Stitchless Composite Membrane Upper - With suede inner frame and sprint web overlay. Pre-Moulded EVA Midsole - For lightweight, long-lasting cushioning. Internally Reinforced Synthetic Upper - With sprint web for lightweight support. Sharp Sharkskin Outsole - For ultimate grip on the track in all weather conditions.