Another season another fastest jersey castelli have ever made after starting the aero jersey revolution in pro cycling weve contiued to perfect this piece while the 2015 aero race 50 jersey represented the biggest leap forward in terms of race performance the new 51 model builds on the race leading aerodynamics while making the jersey more comfortable and durable updated fabrics on the front and back showed a 2 watt gain in the wind tunnel but its not just aero its also extremely lig