In a tour de france stage where the riders cover 150 km in three hours any aero mistake is amplified this jersey uses the most aero fabrics and construction to save nearly 20 watts at 50 kmh compared to our bodyfit pro race jersey it does make some compromises for aerodynamics the high lycra content means its not instantly dry like the bodyfit pro race jersey and the stretch fabric in the back means you wont want to completely load up the pockets those 20 watts arent completely free