Designed for hard core winter riding when only the most dedicated riders are out, the Castelli Sorpasso RoS Tights keep the heat on with Nano Flex 3G warmth and flexibility. With a Progetto X2 Air seamless pad and Nano Flex Xtra Dry panels in high exposure areas to repel water, this tight will keep your legs going through the tough winter season and you'll be flying in the spring.