The all new Mizuno Impermalite F10 Rain Trousers are a lightweight rain pants with 10, 000mm water protection & breathability Designed for movement, the Flex Rain Pants uses Imperma Lite technology to deliver 10, 000mm water protection & breathability. Fit is enhanced by choice of inside leg length Mizuno Impermalite Imperma Lite technology delivers 10, 000mm water protection & 10, 000mm breathability (Japanese Testing Standards) Waterproof Windproof 10, 000MM