Features of the Castelli Women's Free Aero Race 4 Short Vortex dimpled fabric on legs for aero Performance Forza fabric on inner legs with 38% Lycra content for perfect Fit Stripe mesh engineered minimalist bib construction keeps you cool Giro4 leg gripper elastic for better grip distributed over larger Area Doppio v construction in front for increased support and comfort Flat-lock stitching Progetto x2 air seamless seat pad