Focused on lightweight responsiveness and extreme cushioning, the Rev UltraSpring(TM) DuraShocks(R) delivers energy back to your foot. The Rev is powered by a high-performance UltraSpring midsole that delievers a lightweight, supercharged ride for maximum response. Built with Wolverine's best-known comfort technology, DuraShocks Flex, the Rev absorbs shock for long days on your feet.