The adidas Ultra Boost 21 Vivid Red offers the responsive running technology expected of Ultra Boost 21 models in a bold colorway of Vivid Red and Core Black. The upper is crafted with Primeblue, a breathable, synthetic material made from plastic debris reclaimed from the ocean. Plastic overlays secure the laces through 4 pairs of eyelets. This model features a full-length Boost midsole that provides cushioning and additional energy return. The monochromatic design highlights the vibrant Vivid Red hue, while contrasting black detailing enhances the shoe’s Torsion system for a more responsive ride. Released on February 4, 2020, it stands out with its commitment to sustainability.