After starting the aero jersey revolution in pro cycling, Castelli have continued to perfect this piece. This Team Sky Aero Race 5. 2 Jersey 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 compared to previous versions. It may not sound much but over the course of a long ride or race that's a significant energy saving. But it’s not just aero; the Aero race 5. Read more…2 is also extremely light, coming in at just 103g. That’s about 40g lighter than a standard jersey and almost as light as Castelli's own Climber’s Jersey. Just like you, Castelli pro riders are looking for comfort, and the lightweight polyester fabrics in this jersey dry nearly instantly, making this the go-to choice even for cool- or wet- weather racing. The compression band around the pockets keeps them from moving or bouncing no matter how you load them up - perfect for long days in the saddle. When the difference between winning and losing can be so small, any slight gain is an advantage. With the Team Sky Aero Race 5. 2 Jersey you may just have that winning advantage.