Castelli Free Aero Race 4 Kit Bibshort Pro-Proven Comfort, Race-Ready Speed The best-selling shorts in Castelli history, the Free Aero Race 4 has logged millions of kilometers under World Tour pro riders and still delivers uncompromising comfort for racers and enthusiasts alike. Over a decade of continuous refinement means every fabric, stitch, and component has been upgraded, but the minimalist design philosophy that makes it a workhorse remains unchanged. The dimpled Vortex fabric on the legs provides aerodynamic benefits while the soft Forza stretch fabric with 38% Lycra ensures a perfect fit that adapts to your movements. The engineered stripe mesh bib construction keeps you cool, while the updated Progetto X^2 Air Seamless seat pad delivers comfort through your longest efforts. Features Vortex dimpled fabric on legs provides aerodynamic performance while the Forza inner-leg fabric with 38% Lycra content ensures perfect fit and durability Stripe mesh engineered minimalist bib construction reduces weight and maximizes breathability to keep you cool during intense efforts GIRO4 leg gripper elastic with vertical silicone stripes distributes grip over a larger area without restricting stretch SPECIFICATIONSIntended Use Road, Racing Fit Men's - Race Fit Outer Leg Material Vortex dimpled fabric for aerodynamics Inner Leg Material Forza fabric, 38% Lycra content for perfect fit Seat Pad Progetto X^2 Air Seamless with updated design for race comfort Care Instructions See Tag SIZING - MEN'SSize Hip Circumference Inseam XS84" - 88"76" - 79"S88" - 92"79" - 81"M92" - 96"81" - 83"L96" - 100"83" - 85"XL100" - 104"85" - 87"XXL104" - 108"87" - 89" | Castelli | Free Aero Race S Kit Bibshort Men's | Size Large In Azzurro Italia/silver Gray