Castelli Free Aero RC Bib Tight keeps your lower body warm and protected during cold, wet winter rides. Warm and breathable Nano Flex 3G fabric from the knee up has a water-repellent finish which keeps you as dry as possible in inclement weather. On long journeys, all-day comfort is ensured thanks to the Progetto X2 Air's seamless seat cushion and minimalist Free straps , which fit comfortably to the body and do not weigh it down.