Mizuno ImpermaLite Running Jacket Mizuno Impermalite Technology - Provides a performance blend of water and wind protection combined with superior breathability. Dynamotion Fit - Enhanced Fit Technology that provide an optimal fit and moves with where ever your body goes. Reflective Element - For keeping you safe in low light conditions. Back Zip Pocket - For storage of small items. Thumbholes - To keep hands securely covered whilst still maintaining a fluid motion as well as keeping your hands warm.