Zoot Women's Tempo Trainer Running Shoe 100% Synthetic Imported Manmade sole Double Density Midsole - Offers essential stability while you run. Z-Bound Technology - Gives maximum cushioning while still remaining lightweight. Z-Bound Midsole - Rebounds your energy, reducing stress and fatigue, making for a more efficient run. CarbonSpan+ - Provides support and a performance-fast feel. Blown Rubber Outsole - For added rebound in the forefoot, making the shoe lighter and your foot more flexible.