Castelli revamped its revolutionary Free Aero Bib Shorts for 2015, making them even more breathable, aerodynamic, and supportive than the previous model and introducing a women-specific bib short option to the line. These bib shorts are comfy enough for a local century, with technology built to handle the toughest races or training days. The Free Aeros are made of a blend of fabrics designed for durability and cool breathability, mixed with Lycra for a perfect balance between supportive compression and unrestricted movement. The sides and back also have surface dimpling (similar to a golf ball) meant to cut through the wind and get you down the road faster. To complete the fit, Castelli's wide Giro Air leg bands feature a thin, mesh-like gripping surface to keep everything in place and eliminate any uncomfortable bunching or pinching -- just remember to throw on some sunscreen under the leg bands to avoid getting burnt. Castelli rounds out the Free Aero Bib Shorts with the women-specific Progetto X2 Air Donna, an antimicrobial chamois with seamless construction, four-way stretch, and a perforated foam layer for a soft, ventilated, friction-free ride.