Brand new with tags, wrong size for me and too late to return! Manufacturer description: Developed from the ground up for aero efficiency and temperature regulation in hot weather crit races Aerodynamic fabrics placed strategically on the upper body aid airflow and reduce overall drag Lightweight woven main fabric ensures efficient moisture management and thermoregulation Four-way stretch fabrics create a compressive fit for comfort at speed Seamless rear pocket construction sits flush against the body to minimise turbulence All seams are routed away from key aero zones and bonded to reduce bulk Compression fit designed for an aero, on-bike position