The Castelli Free Aero RC Bib Tight is designed to keep your lower body warm and protected during cold, wet winter rides. From the knee up, its warm and breathable Nano Flex 3G fabric features a water-repellent finish to keep you as dry as possible when the weather gets rough. When riding long miles, all-day comfort is ensured with a Progetto X2 Air Seamless seat pad and minimalist Free bib straps that sit comfortably on your body without bulk.