The shoe’s “engine” is revolutionized for a brand-new feel. With Zero-Gravity foam and a slightly thicker underfoot wall for comfort and stability. A new nylon blend Speedboard provides plenty of flex and support. The majority of colorways feature dope-dyed yarn in the upper— a coloring process that uses 90% less water. The shoe also uses 50% bio-attributed Zero-Gravity foam, made of renewable materials like waste cooking oil. The step-in experience is improved with a wider middle bootie – and a more stable heel pillow, to help you move faster, too. Thanks to the high 14 mm heel-to-toe drop, the overall feeling is smooth and bouncy. The breathable design of the new, engineered mesh upper is inspired by our racing shoes. The majority of colorways feature a dope dyed upper for reduced water usage. Plus, the engineered mesh upper is inspired by the Cloudboom Echo 3's materials, so it’s super lightweight, breathable and is soft to the touch. Meaning 20% less CO2e emissions compared to standard EVA midsoles.