The UltraBoost 2020 'Solar Red' applies monochromatic crimson coloring to a lightweight build that combines breathable Primeknit with soft elastane at the heel for a more comfortable fit. A matching red midsole, offering 20 percent more Boost cushioning than adidas’ original UltraBoost, rides on a contrasting black Stretchweb outsole that utilizes Continental Rubber for superior traction.