The Castelli Nano Flex 3G Leg Warmers are a stalwart of your winter cycling kitrain repellent, windproof, warming and luxuriously comfortable, this latest evolution of the Nano Flex technology is Castellis best yet.The Nano Flex 3G fabric used across these leg warmers utilises a combination of newly updated durable water repellent (DWR) treatment and mechanical heat treatment to give previously unheard-of levels of rain protection. Light rain beads off the fabric, keeping you dry when those inevitable rainy spells descend.On the inside of the Nano Flex 3G fabric, a super soft finish and the optimal loft have been achieved through Castellis meticulous research and development. The fabric feels phenomenally comfortable against the skin and the loft traps just the right amount of air above the skin to keep your heat regulated over a wide range of autumn and winter conditions.This latest update to the Nano Flex fabric not only reflects Castellis ongoing commitment to offering you the