Castelli's Free Aero RC DT Bib Tight brings comfort and protection to our cool-weather riding wardrobe, keeping us riding outside as the temperatures drop. From the waist to the knee, Nano Flex 3G fabric provides soft warmth with maximum stretch, while the Nano Flex stretch-woven fabric on the inside of the lower leg protects us from wet roads. For ultimate seated comfort, Castelli added their Progetto X2 Air Seamless Donna seat pad, designed for long hours in the saddle.