The Castelli Nano Flex 3G Kneewarmers in Black are a stalwart of your winter cycling kit – rain repellent, windproof, warming and luxuriously comfortable, this latest evolution of the Nano Flex technology is Castelli’s best yet.Features:Newly updated nano flex 3g fabric for exceptional warmth softness and protection from the rainMinimal seam construction for aesthetic versatility and freedom of movementEasily packable into a pocketHighly breathableOptimal temperature range is 12c 20c